—Many heavy metals are very rare and we shouldn.t throw them away. —______________<br> <br>A、I agree with you.<br>B、It is up to you.<br>C、Who knows.

—Many heavy metals are very rare and we shouldn.t throw them away. —______________

A、I agree with you.
B、It is up to you.
C、Who knows.

出自：国开作业公共政策概论

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