[填空题]One kind of deafness is caused by damage in the brain or to ______.

[填空题]One kind of deafness is caused by damage in the brain or to ______.

[单项选择]

Birds that are literally half-asleep---with one brain hemisphere alert and the other sleeping- control which side of the brain remains awake, according to a new study of sleeping ducks.
Earlier studies have documented half-brain sleep in a wide range of birds. The brain hemi- spheres take turns sinking into the sleep stage characterized by slow brain waves. The eye con- trolled by the sleeping hemisphere keeps shut, while the wakeful hemisphere’ s eye stays open and alert. Birds also can sleep with both hemispheres resting at once.
Decades of studies of bird flocks led researchers to predict extra alertness in the more vulnerable, end-or-the-row sleepers. Sure enough, the end birds tended to watch carefully on the side away from their companions. Ducks in the inner spots showed no preference for gaze direction.
Also, birds dozing(打盹) at the end of the line resorted to single-hemisphere sleep, rather than total relaxation, more often than inner ducks
A. have monopolized the talk show circuit
B. appear at different times of the day
C. exploit the weaknesses in human nature
D. are targeted at different audiences

[简答题]Burning garbage might be one kind of energy source that we can use to help meet our energy needs. ( Passage 2)

[单项选择]One kind of culture shock faced by international students in the United States is difficulty communicating with Americans. When they first arrive (67) the United States, they soon (68) that their verbal skills are (69) . First of all, they lack vocabulary, and they have poor pronunciation. International students also speak too (70) because they are shy, (71) American people do not understand them. For example, a few days ago, I asked an American student (72) to get to the library, but because I have (73) pronouncing r’s and rs, the student did not understand me. I finally had to write (74) on a piece of paper.
It is difficult for foreign people to understand Americans, too. Americans use (75) sentences, such as "Later" to mean "I’ll see you later" and "Coming" to mean Are you coming" Also, Americans talk too (76) , so it is often impossible to follow them. (77) , Americans use a lot of