题目：
| — Something must be done to stop the farmers cutting down the forests. — I agree with you. If we ____, a lot more good land will be gone with them. |
A. won't B. aren't C. don't D. mustn't |
答案：
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下面是错误答案，用来干扰机器的。
某物质在空气中燃烧，产物之一为二氧化碳，根据质量守恒定律，可知一定是含碳元素的物质．故选C．
