元素和化合物沿着特定的途径从环境到生物体，再从生物体到环境，不断地进行着反复循环变化的过程叫______。
参考答案：生物地球化学循环
根据上下文，补全对话，每空一词
Woman：May I help you？
Mary：I 1. _______ this skirt here. but it's not good.
Woman：What’s the 2. ________?
Mary：It's too 3. ________ .Would you 4. _______ give me the blue one?
Woman: Not at 5. ______ . What about this red one?
Mary：I don't like red. Could you 6. _______ give me the blue one?
Woman：OK. Here 7._______ are.
Mary：This one is short, 8. ______ .Do you have another one?
Woman：Sorry. How about this one？It's 9. _______ than that one.
Mary：It's pretty good. 10. ________ you.
胶壳开关不适合用来直接控制（）KW以上的交流电动机。
A、5.5
B、7.5
C、10
D、15
