Question

Now the Internet is a popular channel      the public voice their opinions and show their strength.

1. A.
   by that
2. B.
   through which
3. C.
   through that
4. D.
   by which

Answer 1

B
考查定语从句。句意：现在网络是一种流行的渠道，通过这种渠道，公众提出他们的建议并展示他们的力量。通过渠道through  a  channel，所以选B。