Dermatologists say that it is better to wear sun block______than not to wear it at all.

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问题 Dermatologists say that it is better to wear sun block______than not to wear it at all.

选项 A、periodically
B、incidentally
C、indefinitely
D、precisely

答案A

解析词汇：副词1．这是一道词汇题，选项均为副词。2．本题需要选择一个副词，修饰动词wear。periodically意为“定期地”，(A)为正确选项。

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