To protect environment(保护环境)is________to take care of our  lives.
A. important                 B. as important as
C. more important            D. the most important

To protect environment is ________ to take care of our lives.

A. important

B. as important as

C. more important

D. the most important

To protect environment is ________ to take care of our lives.

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--How dirty it is! We should try to tell people to take care of the environment.

--Good idea! Let's put up a sign. It says that to protect environment is ________ to take care of our lives.

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