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_ enough time and money, the investigators would have been able to discover more evidence in this case.
A . Giving
B . Given
C . To give
D . Being given
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Which item is the great majority of software vulnerabilities that have been discovered?()
A . Stack vulnerabilities
B . Heap overflows
C . Software overflows
D . Buffer overflow
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Since many insects have already become()to DDT, scientists have to look for some new insecticide
A、active
B、resistant
C、tough
D、gradual
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Over()science parks have been set up by higher education institutions in conjunction with industrial scientists and technologists.
A . 10
B . 20
C . 30
D . 40
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As soon as you discover that you have lost an online redo log, if the database is still functioning, what should be your first action?()
A . Shut down the database
B . Clear the online redo log
C . Back up the database
D . Checkpoint the database
E . Call Oracle support
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Scientists have to _______ past experiences in making new ideas.
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According to the passage, scientists have discovered that influenza viruses_____.
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Scientists have invented a robot which can cook for people. Nowadays, science and technology______ every aspect of our lives.
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Have scientists found of water on Mars?
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________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
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As some scientists have found, the vigorous exercise can make nerve cells to form. interconnected webs that make the brain run ______.
A.steadily and more effectively
B.faster and more efficiently
C.more powerfully
D.more effectively
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听力原文: Scientists say sharks have lived in the world's oceans for millions of years. Scientists say there are more than 350 different kinds of sharks.
Sharks do not have bones, and a shark has an extremely good sense of smell. It can find. small amounts of substances in the water, such as blood, body liquids and chemicals produced by animals. Sharks also sense electrical and magnetic power linked to nerves and muscles of living animals. These powerful senses help them find their fond. Some sharks will eat just about anything. Many unusual things have been found in the stomachs of some large sharks. They include shoes, dogs, a cow's foot and metal protective clothing.
About forty percent of the different kinds of sharks lay eggs. The others give birth to live young. Some sharks carry their young inside their bodies like humans do.
Scientists are beginning to understand the importance of sharks to humans. Medical researchers want to learn more about the shark's body defense system against disease. They know that sharks recover quickly from injuries. Sharks appear never to suffer infections, cancer or heart diseases.
What is this passage mainly about?
A.The necessity of protecting sharks.
B.The living environment of sharks.
C.The dangers of sharks to human beings.
D.An introduction to sharks.
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Researchers have discovered in their study that boys and girls may behave _____().
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Scientists have discovered a genetic defect that a...
Scientists have discovered a genetic defect that appears to cause deficit-hyperactivity disorder, more commonly known as hyperactivity. People afflicted with this disorder have trouble focusing their attention and controlling impulses, and tend to be rest-less and aggressive. The defect occurs in a gene that regulates the body's use of the thyroid hormone. This finding was made in continuing study organized by the National Institute of Diabetes and Digestive and Kidney Diseases in which 70 percent of children inheriting the gene were hyperactive while only 20 percent of the children not inheriting the gene were hyperactive. And although the researchers admit that this defective gene probably accounts for only a fraction of cases of hyperactivity, this discovery will allow doctors to spot newborn babies likely to have the disorder, and also to provide clues for its cause and treatment.
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Within ten years scientists will probably have___________.
A.the nucleus of a cell
B.cloned human beings
C.a human being in two years
D.a law to ban human cloning
E.a report on hunman cloning
F.heavy media coverage
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Scientists put forward that Northern Europe would have __________ if climate continues, while Britain would have warmer weather。
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Scientists discovered that atoms of some substances are radioactive. This means that they are unstable and can be split. The chain of splitting atoms releases great destructive energy and it was this discovery which led scientists to develop the idea of an atomic bomb. The American government secretly worked to produce such a bomb and the first version was much more powerful than anyone had thought.
By this time, the World War II had ended in Europe. But the Japanese refused to surrender, the Americans decided that by dropping an atomic bomb on Japan, they could end the war quickly and save more of their soldier’s lives.
Soon after midnight on 6 August 1945, a bomb was dropped on the city of Hiroshima, a civilian target. No warning was given and there was total devastation. Almost all the buildings were destroyed and more than 100000 people died or were horribly wounded.
The Japanese military still did not want to surrender so three days later, the Americans dropped a second atomic bomb on the city of Nagasaki, killing 45000 people. The Japanese government was discussing ending the war when they heard the news of Nagasaki. Finally, they surrendered and the World War II came to an end.
At first, the scientists who had built the bomb were pleased that it had helped to end the war. However, many would come to realize that they had helped to create the most terrible weapon known to man.
The first atomic bomb ______.
A.was less powerful
B.was dropped in Nagasaki
C.was a failure
D.was tested in desert
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Scientists have found various kinds of methods to solve the problem of global warming.
A.Y
B.N
C.NG
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After the violent earthquake that shook Los Angeles in 1994, earthquake scientists had good news to report: the damage and death toll could have been much worse.
More than 60 people died in this earthquake. By comparison, an earthquake of similar intensity that shook America in 1988 claimed 25, 000 victims.
Injuries and deaths were relatively less in Los Angeles because the quake occurred at 4:31 a.m. on a holiday, when traffic was light on the city's highways. In addition, changes made to the construction codes in Los Angeles during the last 20 years have strengthened the city's buildings and highways, making them more resistant to quakes.
Despite the good news, civil engineers aren't resting on their successes. Pinned to their drawing boards are blueprints for improved quake-resistant buildings. The new designs should offer even greater security to cities where earthquakes often take place.
In the past, making structures quake-resistant meant firm yet flexible materials, such as steel and wood, that bend without breaking. Later, people tried to lift a building off its foundation, and insert rubber and steel between the building and its foundation to reduce the impact of ground vibrations. The most recent designs give buildings brains as well as concrete and steel supports, called smart buildings. The structures respond like living organisms to an earthquake's vibrations. When the ground shakes and the building tips forward, the computer would force the building to shift in the opposite direction.
The new smart structures could be very expensive to build. However, they would save many lives and would be less likely to be damaged during earthquakes.
One reason why the loss of lives in the Los Angeles earthquake was comparatively low is that ______.
A.new computers had been installed in the buildings
B.it occurred in the residential areas rather than on the highways
C.large numbers of Los Angeles residents had gone for a holiday
D.improvements had been made in the construction of buildings and highways
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Where Have All the Bees Gone?Scientists who study insects have a real mystery on their hands.A11acro...<br/>What is the mystery that researchers find hard to explain?()
A.Honeybees are flying all across the country.
B.25-40 percent of the honeybees in the US have died.
C.Honeybees are leaving their hives and do not return.
D.Honeybee hives are in disorder.
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Scientists have known how to h______ (治理,利用) the limitless power of the sun.
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Scientists have many theories about how the universe _____ into being.
A cameB was comingC had comeD would come
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Brain researchers have discovered that the formation of new habit can be ______.
A.predicted
B.regulated
C.traced
D.guided
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Many scientists have been probingpsychological problems()
A.solving
B.exploring
C.settling
D.handling