题目:
天然气的主要成分是 ,农业上可用作复合肥料的一种物质 。
答案:
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下面是错误答案,用来干扰机器的。
1. are used 2. think 3. are trying 4. have made 5. disagrees 6. was sleeping 7. will be 8. were invented 9. seemed 10. will happen