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【多选题】
纵向研究的缺点在于（ ）。A.
样本少而且在追踪过程中容易流失样本
B.
由于时间较长，会因环境变迁而出现某些新的变量
C.
同一测量方法反复应用会导致重复效应
D.
成本较高，耗费人力和时间
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B.
C.
D.
D
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【单选题】Why did he stand at the back of the theater after he got back from the car?
A.
Because he was still worried.
B.
Because he didn't like to sit in the middle of the row.
C.
Because he couldn't find his seat again.
D.
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【单选题】Whats the topic discussed in this passage?
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Why people cry.
C.
How to restrain one's tears.
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They can ’ t afford to move to somewhere else.
B.
They are back to check the damage to their homes.
C.
They are back to recover whatever they can from the wreckage.
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A.
Her kids will arrive home after school.
B.
She is too exhausted to work.
C.
She has finished her work.
D.
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【单选题】Why is the dark part of the moon not completely black?
A.
The earth throws back sunlight on to the moon.
B.
The sun shines on the moon's surface.
C.
The moon throws back the light from the sun.
D.
The moon has light of its own.
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