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  3. How can researchers in "sleep laboratories" tell that the animals they are observing are asleep or not?

How can researchers in "sleep laboratories" tell that the animals they are observing are asleep or not?

admin2010-02-19  48
问题 How can researchers in "sleep laboratories" tell that the animals they are observing are asleep or not?
选项 A、They see if the animals respond to light and sound.
B、They do this by observing changes in the animals’ brain signals, breathing, heartbeat, and muscle activity.
C、They see if the animals’ eyes are closed.
D、They can tell this by seeing if the animals lie down or not.
答案B
解析 prompt促使，激励；promote促进，助长；propel推进，推动；proceed进行。propel和 promote后不能跟不定式做宾补，proceed只能做不及物动词，所以都不能选。
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