单选题：Different children learn their native languages at sharply d

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题目内容：
Different children learn their native languages at sharply different speed. A．True
B．False
C．Not Given
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答案解析：

Warming in the Northern Hemisphere was large in________at mi

Warming in the Northern Hemisphere was large in________at middle and high latitu

分类：英语(二)  题型：单选题
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As discovered by expedition scientists, Antarctica has not a

As discovered by expedition scientists, Antarctica has not always been so cold a

分类：英语(二)  题型：单选题
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