[填空题]The virus may then he inactive for years.

[填空题]The virus may then he inactive for years.

[填空题]Evidence shows that the AIDS virus may also attack the nervous system, ______ (对大脑造成损害).

[填空题]The people infected with rabid virus may present strange behavior, agitation, lack of fear of dangerous animals, foaming at the mouth.

[单项选择]

"Motherhood may make women smarter and may help prevent dementia(痴呆) in old age by bathing the brain in protective hormones," US researchers reported on Thursday.
Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer’s dementia (早老痴呆症). University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans.
"Our research shows that the hormones of pregnancy (怀孕) are protecting the brain, including estrogen (雌激素), which we know has many neuroprotective (保护神经的) effects," Kinsley said.
"It’s rat data but humans are mammals just like these animals are mammals," he added in a telephone interview. "They go through pregnancy and hormonal changes."
Kinsley said he hoped public
A. Some researchers have told them.
B. Many women say so.
C. They know it by experimenting on rats.
D. They know it through their own experience.

[简答题]The bird, however hard the frost may he, flies briskly to his customary roosting-place, and, with beak tucked into his wing, falls asleep. He has no apprehensions; only the hot blood grows colder and colder, the pulse feebler as he sleeps, and at midnight, or in the early morning, he drops from his perch—dead.
Yesterday he lived and moved, responsive to a thousand external influences, reflecting earth and sky in his small brilliant brain as in a looking-glass; also he had a various language, the inherited knowledge of his race, and the faculty of flight, by means of which he could shoot, meteor-like, across the sky, and pass swiftly from place to places and with it he was able to drop himself plumb down from the tallest tree-top, or out of the void air, on to a slender spray, and scarcely cause its leaves to tremble.
Now, on this morning, he lies stiff and motionless; so easy and swift is the passage from life to death in wild nature! But he was never miserable.

[单项选择]It may he said that we think with our muscles in somewhat the same way that we listen to music with our bodies.（）
A. 人们可能会说，我们用肌肉来思考，在某种程度上和我们用身体来听音乐是一样的。
B. 可以说我们用肌肉思考，在一定程度上，正如我们用整个身体来倾听音乐一样。
C. 有人可能会说我们用身体来听音乐的方式有点像我们的用肌肉思考的方式。
D. 我们思考，用我们的肌肉；同样地，我们也听音乐，用我们的身体。