Question

1. roller coaster is too old. Don’t you think it is useless one?

   A. A;the   B. An;the

   C. The;a   D. The;an

Answer 1

 1.C 前空是特指，所以须用定冠词the;后空表泛指且 useless白勺首字母U发音是/ju:/，所以须用a修饰。