A．Because a mouse can lose weight no matter how much it eats.

　　B．Because the weightlosing tests were made on the mouse.

　　C．Because the mouse has a very good metabolism.

　　D．Because the author wants to try the food without the enzyme.

　　解析：选B。细节理解题。作者在第四段指出要想多吃还不胖，除非变成休斯敦贝勒医学院减肥实验中所用的那只老鼠，故选B项。

　　7．In the experiment, the mice without those enzymes ________.

　　A．were in good condition

　　B．put on weight

　　C．became weak

　　D．could not have baby mice

　　解析：选A。细节判断题。根据第六段第一句话可知，没有酶的老鼠的身体仍然健康如故，能繁育后代，行为与其它老鼠并无两样，故选A项。

　　8．What does the author want to show through the last two paragraphs?

　　A．You can be free of guilt when having big dinners.

　　B．Scientists cannot find the key to identifying the enzyme.

　　C．Don't overeat before the test is made on humans.

　　D．It is unnecessary to control weight at present.

　　解析：选C。推理判断题。文章最后两段说明此类药物仍在开发过程中，还未在人类身上进行实验，目前要想保持体重，关键还是在于不要过量饮食，故选C项。

　　C

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　　【解题导语】　文章向我们介绍了两家以建造节能窗户为主要特色的公司及其联系方式。

　　9．According to the ads, the two companies are both expert at______.

　　A．making windows and doors that suit the look of your home

B．persuading people to want what have already been built