问题 单项选择题

水中某些污染物可通过水中的生物放大作用,使生物体内含量大大高于水体中浓度

A.水生生物

B.食物链

C.生物迁移

D.生物转化

E.氧化还原反应

答案

参考答案:B

解析:水中某些污染物可通过水中食物链的生物放大作用,使生物体内含量大大高于水体中浓度。

完形填空
Dear Peter,
I hope everything is going well with you !
I’m glad __41__ your letter asking for my __42__ on how to learn Chinese well.
Here are__43__suggestions. Firstly, you can take part__44__a Chinese course. There you can learn from the teachers and practice with your classmates as possible as you can. Secondly, __45__is important to read some newspapers about__46__and watch Chinese TV programs whenever possible. Besides, it is also a good idea__47__and sing Chinese songs, it can improve your oral Chinese and by__48__so, you’ll learn and remember Chinese words__49__
I think__50__to improve your Chinese is by making more Chinese friends. You can chat and do something__51__them together.__52__you want to learn it, they will tell you a lot about China and help you learn Chinese. I believe you can learn Chinese__53__.
Try__54__to me in Chinese next time. Good luck to you!
Best__55__!
Yours,
Li Hua
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单项选择题