题目内容

---I have a really good weekend at my uncle's.--- .

A. Oh,that's very nice of you
B. Congratulations
C. It's a pleasure
D. Oh, I'm glad to hear that

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---I'm going to Shanghai tomorrow. My plane leaves at 8:30 in the morning.--- .

A. Is that so?
B. How wonderful!
C. Have a good trip!
D. Well, good bye.

一般矿区中，可通过发现（）中的地球化学异常来找矿。

影响植物灰分中可变含量的因素

植物灰分中的微量元素含量可分为（）和（）。