15．A。穿毛衣时衣领子挤压眼、鼻引起疼痛，故应选collar。

17

The computer plays an important part in our everyday life. It is one of the great __1__ in the world in the __2__ century. It works for us not only at home, in the offices, in big shops, __3__ at schools. Today it is used __4__ many ways. It really __5__ the world large wealth (财富) and happiness.

The first computer in the world was __6__ Enid. It was built in America in 1946. It was __7__ and heavy. __8__ it was born, it has been developing very fast. Until now it has gone __9__ four periods(时期，阶段)and changed a lot. There’re many kinds of computers. Computers are getting smaller and smaller and computing faster and faster. It becomes more and more __10__.

The computer can do most of the things __11__ the people. It can help us to __12__ about the real world more quickly, to learn __13__ we want to learn and to think __14__ ourselves. __15__ a student in the twenty-first century, you must work hard at it.

14．B。take　 a　 sweater　 off意为“脱去毛线衣”。

13．B。医生对自己经常检查的病人，出现新的病情应作为严肃的事情来处理，故应选seriously。

12．C。妈妈感到惊讶是因为她从未听儿子提到过这回事，故应选never。

11．D。深爱儿子的妈妈第一次听说儿子鼻子、眼睛有问题应感到惊讶，故选择surprised。

10．C。医生的问题用了现在完成时态，对之作出的回答也应用现在完成时，即：Yes ，I　 have。

9．B。医生问了一个问题，他要作出回答，因此得思考一会儿，故选择thought。

8．D。have　 trouble　 with　 sth 意为“在某方面有麻烦”为一习惯用语。

7．B。上文提到一年要去医院检查四次，下文将要讲到其中一年里发生的一件事情，故选years从而形成对应。

6．B。look over为固定词组，意为“检查”。