The Internet is really to us. We can download a lot of things from it.A. usefulB. difficul

问题补充：

The Internet is really to us. We can download a lot of things from it.

A. useful

B. difficult

C. different

D. safe

答案：

(答案→)A. useful

B. difficult

C. different

D. safe

解析：考查形容词的词义辨析。从后面“能下载好多东西”可知它“很有用”。