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

问题补充：

The Internet is really to us. We can get 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：句意：因特网对我们确实有用，我们可以通过它获得很多东西。所给选项中A是有用的，B是困难的，C是不同的，D是安全的，根据题意此题选A。