题干

目前治疗癌症的方法有化疗和放疗,其中化疗的原理是(    )

A:直接作用癌细胞表面杀死癌细胞

B:抑制纺锤体的形成抑制癌细胞增殖

C:抑制DNA的复制抑制癌细胞增殖

D:化学药物作用于中心体抑制细胞分裂

上一题 下一题 0.0难度 选择题 更新时间:2010-05-26 10:43:30

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C

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I'm David.When I was 13,my parents decided that I should go to England to improve my English.I had never been to other countries before,so I felt a little worried.My parents prepared everything for my journey.My plane was due(预期)to leave at 9:30 a.m.and arrive in two hours.I phoned the English family who I would stay with and they told me they would wait for me at the airport(机场).

Unluckily my plane to London was delayed (延误).I tried to phone the English family again but I couldn't speak to them because they had already left home for the airport.

When I arrived in London.it was already 1:30p.m.I went to get my luggage(行李)but I couldn't find it.I became very worried.Luckily, the airport staff(工作人员)was very helpful and efficient.I didn't wait long-they found it 10 minutes later.

My English family were still waiting for me! I was so happy! Then my new life in London began.My English family were quite kind.I learned a lot of English because I spent most of the day talking in English.I played computer games with the little boy in my English family.I also taught him how to play chess.Sometimes I told him stories I learned from my family.

I missed my family during my stay in London.but I also feIt sad when my stay there came to an end.My English family held a party for me.I enjoyed it very much.I’ll never forget that summer in London! It is one of the most wonderful experiences I've ever had.