单选题：根据下列材料请回答题Walking regularly helps elderly peopleA. lose weig

题目内容：

根据下列材料请回答题

Walking regularly helps elderly people
A. lose weight.
B. become happier.
C. concentrate better.
D. look younger.

参考答案：

答案解析：

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By the end of summer 2007 the ice cover in the Arctic wasA．38million square kilo

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某货主托运一票货，该货的积载因数是1.6立方米/吨。如将该票货装于某拼箱公司的国际标箱1CC箱中，已知该集装箱自重为2.5吨，最大总重量为24吨，计算亏箱后最大

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