单项选择题

According to the observation of some scientists, we will be short of energy in the near future.（）

A、按照科学家的观察, 在将来我们将缺少能源。
B、据科学家观察, 不久的将来我们面临能源危机。
C、按照一些科学家的说法, 我们在将来会面临能源短缺。
D、据科学家观察, 人的寿命会因能源问题而变短。

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单项选择题

When the cloud lasts for a long time. birds are able to（）.

A．delay setting off on journey
B．guided by the magnetic field of the earth
C．use their “internal clock” to arrive in time
D．tell the right direction by the“internal clock”

问答题

First of all, eyes have to rest when it works two hours later. Then you should insist doing eyes exercises twice a day. It is good for eyes to look farther some times. Don’t read in a bed or driving cars or the place where is dark. Don’t read under the sun. If there are something in your eyes, don’t rub, you should flush with the boiled and cooled water. If it hasn’t reason. you must ask for doctors. If you must narrow the eyes to see things clearly, then you should wear glasses.