7．D 解析：细节理解题。根据倒数第二段中的“The grand prize of $7,500 went to St. John Lutheran School in Michigan.”可知，该题选D项。

　　8．A 解析：推理判断题。根据倒数第三段中的“Because at that age in the United States, they have to elect the math courses...they will never be an engineer.”可知，数学对于想成为一个工程师来说是非常重要的。故A项正确。

　　Ⅲ.七选五

　　Fish

　　Fish come in all kinds of shapes, sizes and colors. They first appeared in the oceans of the earth about 500 million years ago. Today there are tens of thousands of different kinds of fish and new species are discovered every year.

　　Where fish live

　　__1__ They preferably live in areas where warm and cold currents(水流) meet. And about 40% of fish species are in fresh water. Some of them live in the clear water of rivers while others prefer muddy pond water. A few types of fish can swim in both salt and fresh water.

　　Senses

　　Fish have organs that tell them what is happening in the water around them. They can see left and right at the same time. They not only can hear sounds in the water but can also sense sounds that happen on the surface.__2__

　　Bodies of fish

　　Fish have no neck. The head and the body are combined. Most fish are shaped like cigars so that they can travel very quickly. Fish are cold－blooded. __3__ The skin of most fish is made out of a special slippery substance(物质). Fish breathe oxygen from the water they live in.

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