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问题 选择题

He's now used to ______ early. But he used to ______ late in the morning. [ ]

A. getting up; sleep

B. get up; sleep

C. getting up; sleeping

D. get up; sleeping

答案

答案：A

问答题

用细线系住金属勺柄，把线的两端用手分别按在两只耳朵上，晃动身体使勺能够敲击桌子的边缘，你听到的声音情况如何？让线离开耳朵，手拿金属勺敲击桌子的边缘(注意在两次实验中保持耳朵与金属勺的距离不变)，听到的声音情况如何？比较两次听到的声音有什么不同，试分析这是为什么？

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选择题

However, at times this balance in nature is disturbed,_____ a number of possibly unforeseen effects.[ ]

A. lying in

B. calling in

C. resulting in

D. taking in
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