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问题 选择题

据报道，人工光合作用能够借助太阳能，用CO2和H2O制备HCOOH，其反应原理如下：2CO2+2H2O 2HCOOH+O2，下列说法正确的是

A．HCOOH分子中含有极性键，又有非极性键

B．反应中，CO2被氧化，O2是还原产物

C．反应中，每转移4×6.02×1022个电子，生成2.24L气体

D．该过程是将太阳能转化为化学能的过程

答案

答案：D

题目分析：A、同种元素之间形成非极性共价键，该分子中没有非极性共价键，错误；B、O\从-2到0，发生氧化反应，为氧化产物，错误；C、产生气体的状况，没有标明，不能确定其体积，错误；D、正确。

阅读理解
Below are some suggestions given by the English children posted on the website about how to help Africa. Which do you think is the best?
I think health is the most important thing. We need to make sure that the money we give is spent wisely. The money should be spent first on clean water supplies and better health care.
Robin, aged 16, Birmingham
I think the most important thing is to improve the education of the African countries. There is an old saying,  "If you give a man a fish, you'll feed him for a day. If you teach him how to fish, you'll feed him for a lifetime." We need to help themselves, not just throw money at the problem when it appears.
Rebecca, aged 15, Liverpool
People seem to give a lot more money to charity when there is a sudden, huge disaster（灾难）like the earthquake. It's good for people to do so, but I also think that everyone should give a small part of their salary（工资）to charity. If everyone did that, it would make a big difference.
Mary, aged 14, Stratford-on-Avon
Giving money to charity can help, but it's not the final answer. I think what these countries need is a good government.
Bethany, aged 16, Newcastle
The best thing we can do is to send experts（专家）like engineers, doctors and teachers to help the people to help themselves.
Robert, aged 16, Cardiff
小题1:Which two children share the similar opinion?
A．Mary and RebeccaB．Bethany and Mary
C．Rebecca and BethanyD．Rebecca and Robert
小题2:Who pays more attention to African's health care?
A．MaryB．RobinC．RebeccaD．Robert
小题3:Where are these suggestions posted?
A．In the textbookB．On the website
C．In the guidebookD．In the magazine
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单项选择题

声学计量的参量很多，其中应用最广泛的一个量是（）。

A、声强

B、声压

C、声功率

D、质点速度
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