答案：B　细节题。根据文章第二段3,4行，These microbes must be removed or killed before the water is not clean, people who drink this water may get these diseases可知这样的水里含有很多有害的物质，喝了会让我们生病，影响我们的健康。故B正确。

　　27．What can we know about man­made lakes?

　　A．It is used through the whole process of purification

　　B．Only rain water can be collected and stored in it

　　C．Water collected can be stored and filtered in it

　　D．Water from them contains a lot of impure substances

　　答案：D　细节题。根据文章第三段最后3句Man­made lakes called reservoirs are used for this purpose. Water from the rains, other lakes, streams and rivers is collected in the reservoirs. This water is usually dirty and muddy。可知在这样的人工湖里的水是很脏的。故D正确。

　　28．What is probably this passage?

　　A．A news report

　　B．A book review

　　C．A magazine article

　　D．A school paper

　　答案：C　推理题。本文主要讲述的是净化水的过程，属于科普类的文章，最可能出现在科普类短文杂志里。故C正确。

　　C

　　Babies who are slow to gain weight in the first months of their lives generally catch up to their peers by age 13，a large UK study shows. Researchers said the results would make parents whose babies fail to put on weight quickly less worried.

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