问题补充：
– The Internet is really to us. We can easily find different kinds of information.
A. safe
B. quick
C. boring
D. helpful
答案：
A. safe
B. quick
C. boring
(答案→)D. helpful
解析：根据后文的内容We can easily find different kinds of information.
故用形容词helpful来修饰，故选D
