certain（）

A . On B . With C . on D . At

A . inherent characteristics B . weight C . destination D . danger to huma

A . composes of B . is made up C . consists of D . makesup of

A . is it B . are you C . they are D . you are

A . at B . in C . on D . to

A．Trying to enter the museum after 5:00 p. m. B．Taking pictures in front of the museum. C．Talking loudly when you enjoy the collections. D．Eating and drinking wherever you are.

A．to be accused B．having accused C．to have been accused D．being accused

A．Internet. B．TV shows. C．Newspapers.

A.famous B.sensational C.noted D.emotional

A、upset B、shake C、shave D、drag

We judge race usually from the coloring of the skin: a white race, a brown race, a yellow race and a black race. But【52】you were to remove the skin you could not tell anything about the race to which the individual belonged. There is nothing in physical structure, the brain or the internal organs to【53】a difference. There are four types of blood. All types are found in every race, and no type is distinct to any race. Human brains are the【54】No scientists could examine a brain and tell you the race to which the individual belonged. Brains will【55】in size, but this occurs within every race.【56】does size have anything to do with intelligence. The largest brain ever examined belonged to a person of weak【57】. On the other hand, some of our most distinguished people have had【58】brains. Mental tests which are reasonably【59】show no differences in intelligence between races. High and low test results both can be recorded by different members of any race.【60】equal educational advantages, there will be no difference in average standings, either on account of race or geographical location. (51) A．complete B．full C．total D．whole

A．cautious predictions. B．impartial judgment. C．careful calculation. D．simple statistics.

A．What do you think of the movie B．What about an action movie C．Would you like to buy tickets for 6 a.m. D．Would you like to go to the movies with me tonight

A．account for B．confess C．crush D．inherit E．manufacture F．meltG．propertyH．release

Although no one is certain why migration occurs, there are several theories. One theory is based upon the premise that prehistoric birds of the northen Hemisphere were forced south during the Ice Age, when glaciers covered large parts of Europe, Asia, and North America. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit, and now, although the glaciers have disappeared, the habit continues. Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics. A more recent theory, known as photoperiodism, suggests a relationship between increasing daylight and the stimulation of certain glands in the birds' bodies that may prepare them for migration. One scientist has been able to cause midwinter migrations by exposing birds to artificial periods of daylight. He has concluded that changes occur in the bodies of birds due to seasonal changes in the length of daylight. According to one theory, when the glaciers disappeared, birds ______. () A．stopped migrating B．continued migrating C．began migrating again D．migrated south and stay there

A．can B．might C．could D．will