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正是由于公益广告自身的特性决定公益广告是一种政府行为，对大众进行道德、文明教育，让我们的社会变得越来越

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Why are there two teams to study the same ice？
[A] Because they belong to different countries.
[B] Because they compete against each other.
[C] Because they want to confirm their findings.
[D] Because there are too many ices for only one team.

At which frequency is the sound audible to human beings？
[A] Fewer than about 20 vibrations per second.
[B] More than about 20,000 vibrations per second.
[C] About in a range of 20 and 20,000 vibrations per second.
[D] 120 vibrations per second.

Word文档默认的扩展名是()。

[A] Boys and girls share different incentives in math learning.
[B] The girls are more anxious about their future career.
[C] The boys consider that fishing doesn't necessarily need math.
[D] The boys spend more time on their part time jobs.