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【单选题】
W hat is the topic sentence in the following paragraph? To avoid sleep problems, alcoholic beverages or drinks with caffeine should be taken before bedtime. A nother way to avoid sleep problems is to eat healthy food. ... These are some simple guidelines that can help you avoid sleep problems.A.
The first sentence.
B.
The second sentence.
C.
The last sentence.
D.
The first and the second sentences.
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