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【单选题】
一平面简谐波在弹性介质中传播，某从最大位移处向平衡位置运动的过程中，下面哪些说法是正确的？A.
的势能转换成动能；
B.
的动能转换成势能；
C.
它从相邻中获得能量，其能量逐渐增大；
D.
它把自己的能量传递给相邻，其能量逐渐减小；
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【单选题】Little _____ about A-H1N1 so far, so there is no doubt that many people are afraid when talking about the disease. [ ]
A.
did scientists know
B.
scientists have known
C.
have scientists known
D.
had scientists known
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【单选题】Where Have All the Bees Gone? ?? Scientists who study insectshave a real mystery on their hands. All across the country, honeybees areleaving their hives and never returning. Researchers call this phe...
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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