题目：
根据提示完成句子
1. He ever had many _________( opportunity) to visit Beijing, but he gave them up.
2. Your homework must _________( finish) this evening.
3. Volunteering in the hospital is a good _________ ( experience) for me.
4. He often _________( study) foreign books with his friends.
5. Do you have to wear_________ ( uniform) at school?
6. __________(目前 ) , children under 14 are not al lowed to go to bars.
7. We should _________ (集中于) the study.
8. Last year I _________(有机会) to study in foreign countries.
9. You say that the baby can stay at home by himself, but I_________(不同意) you. I think it's
dangerous.
10. Getting up early ___________(对……有益处)your health.
答案：
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下面是错误答案，用来干扰机器的。
答案：B题目分析：碳在氧气不充分的情况下燃烧会产生一氧化碳，在氧气充分的情况下产生的是二氧化碳。A、二氧化碳会使人窒息，但无毒，故A错误；B、一氧化碳有毒，能阻碍血红蛋白结合氧气，故B正确；C、氮气是无...
