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On the approach of a warm front the barometric pressure usually（）.
A . falls
B . rises
C . is steady
D . is unreliable
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As it approaches，a typical warm front will bring（）.
A . rising temperatures and falling barometric pressure
B . falling temperature and pressure
C . falling temperatures and rising pressure
D . rising barometric pressure and temperature
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Britain’s climate is influenced by（）,a warm ocean current that passes the western coast of the British Isles and warms them.
A . the North Atlantic Drift
B . the Brazil Current
C . the Labrador Current
D . the Falkland Current
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A sudden drop in diesel engine cylinder compression pressure can be caused by（）
A . a leaking fuel injector nozzle
B . a clogged air filter
C . excessively early fuel injection
D . malfunctioning valve
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Sudden unloading of a diesel engine can cause（）.
A . decreased fuel efficiency
B . increased exhaust temperature
C . black smoke
D . overspeed tri
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If a vessel takes a sudden severe list or trim from an unknown cause，you should FIRST（）.
A . determine the cause before taking countermeasures
B . assume the shift is due to off-center loading
C . counterflood on the side opposite the list or trim
D . assume the cause is environmental force
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A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）
A . a leaking fuel injector nozzle
B . a clogged air filter
C . excessively early fuel injection
D . malfunctioning valve
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A warm air mass is characterized by（）.
A . stability
B . instability
C . gusty winds
D . good visibility
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A star that suddenly becomes several magnitudes brighter and then gradually fades is a（）.
A . double star
B . variable star
C . nova
D . nebula
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A shipmate chokes suddenly，cannot speak，and starts to turn blue. You should（）.
A . perform the Heimlich maneuver
B . make the victim lie down with the feet elevated to get blood to the brain
C . immediately administer CPR
D . do nothing until the victim becomes unconsciou
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Persons who have swallowed a non-petroleum based poison are given large quantities of warm soapy water or warm salt water to （）
A . induce vomiting
B . absorb the poison from the blood
C . neutralize the poison in the blood
D . increase the digestive process and eliminate the poiso
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A sudden break in the cloud allowed rescuers to _ Michael Benson.
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Never give up hope, that's my motto. Always has been, always will be. You remember that winter's morning? Walking on the beach in the snow? We thought we'd never find anything. Give up although. When suddenly, out of the blue, we find a treasure!
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I was writing a letter, suddenly a man came in.
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“I cannot drink warm milk.” is a compound sentence.
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“soon, beginning, later, suddenly, during” are transitions for maintaining a time sequence.
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A ____ belt is to protect the driver from sudden movement.
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In a sudden ______ of anger，the man tore up ？
<span style="color:464646">In a sudden ______ of anger<span style="font-size:13px;color:464646">，</span></span><span style="font-size:13px;color:464646">the man tore up everything within reach.</span>
<span style="font-size:13px;color:464646">A) attack</span><span style="font-size:13px;color:464646">B) burst</span><span style="font-size:13px;color:464646">C) split</span><span style="font-size:13px;color:464646">D)</span>
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There was a terrible noise______ the sudden burst of light.
A．followed
B．following
C．to be followed
D．being followed
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【C9】______a person can keep himself warm,
A.As
B.Where
C.Unless
D.When
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A receptionist should visitors warmly.
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It’s _______ outside. Put on your thick coat to keep you_______. A．enough cold, hot B．cold enough, warm C．cold enough, warmly D．enough cold, warm
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His thoughts were________from this painful topic by the sudden arrival of a neighbour.
A．A.attracted
B．B.retracted
C．C.distracted
D．D.protracted
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Scientists have long believed one way to stop the Earth’s atmosphere from warming is by planting more trees. The idea is that more trees will take in or absorb some of the carbon dioxide in the atmosphere. Carbon dioxide is a gas released by cars, factories and other human activities. The gas traps heat in the Earth’s atmosphere, which warms the planet. However, two new studies have found that trees may not be as helpful in reducing carbon dioxide as had been thought.
The first study was done at Duke University in Durham, North Carolina. Researchers pumped extra carbon dioxide into a test area where pine trees were growing. The trees grew thirty-four percent faster during the first three years. However, in time, the trees slowed to about their normal growth rate. The scientists say this is because trees need other nutrients, such as nitrogen.
In the second study, researchers from Duke and Bowdoin College in Brunswick, Maine examined the soil around trees. They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was released into the atmosphere as carbon dioxide.
The findings of the two studies were published last month in Nature magazine. They suggest there is limited value in planting trees to reduce the carbon dioxide pollution in the atmosphere.
Forest planting has been a part of negotiations on a world agreement to reduce greenhouse gases that scientists believe cause global warming. The United States, Canada, Japan and some other industrial countries have supported the idea. But this new research suggests the idea is not as effective as environmental activists had thought. Scientist Ram Oren of Duke University led the study on tree growth. He says that earlier estimates on the ability of forests to absorb carbon dioxide were overly hopeful.
Some scientists not involved in the studies say the research provides some of the first evidence on how trees react to carbon dioxide. Other scientists say the research disputes a belief among some coal and power companies. The companies say that rising levels of carbon dioxide in the atmosphere will not create harmful global warming. Instead, they say it will increase forests and other plants.
What is the purpose of this passage？
A．Introduce some new ideas about the relationship between trees and carbon dioxide.
B．Introduce recent condition of global industrial pollution.
C．Call on people to plant more trees to reduce greenhouse gases.
D．Point out that power companies should be responsible for the rising levels of carbon dioxide.
