In order to protect our planet, _____

A. all kinds of pollution should be reduced

B. we should reduce all kinds of pollution

C. the environment should be protected first

D. it ’ s important to protect our environment

In order to protect our planet, _____.

  　A. all kinds of pollution should be reduced　

B. we should reduce all kinds of pollution

C. the environment should be protected first　

D. it’s important to protect our environment