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问题 选择题

下图是市场上常见的两种燃料电池示意图

下列有关电池电极a、b、c、d的叙述正确的是 [ ]

A．电极a为正极，电极反应产物为H2O

B．电极b为正极，电极反应产物为H2O

C．电极c为正极，电极反应产物为H2O

D．电极d为正极，电极反应产物为H2O

答案

答案：C

听力题

根据短文内容及首字母提示，填写所缺单词，使短文意思完整。每空限一词。

Dear Peter,

I’m glad to receive your letter. Thank you for your caring for the weather and my health. Now I’d like to tell you something a_____小题1:____ the smog（雾霾）.

Since the winter last year, the smog has t_____小题2:_____ place for several times. It has done great harm to our d_____小题3:_____ life. Many traffic accidents happened just because of the heavy smog weather. More and more people have to go to see the d____小题4:___ because of the serious disease caused by the smog. Quite a lot of flights have to be put off. A great number of people have to stay at h_____小题5:____ for fear of the poisonous air caused by the smog.

People have realized the great harm caused by the smog and the importance of p____小题6:______ the environment. People from all over the country are taking actions to reduce the smog weather. The g_____小题7:_____ asks people to go to work or school with the public traffic, such as the bus and the u_____小题8:_____. Also we should plant more trees.

According to me, I will go to school by bike or on foot, and I won’t throw the waste a___小题9:____. In addition, I will tell the people that all of us should try our best to protect the environment. Would you like to tell me some good ideas? I’m looking f____小题10:___ to your reply.

Yours,

Wang Hua
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选择题

测得生活中一些物质的pH如下表，判断下列说法错误的是（　　）

物质肥皂水食盐水唾液柠檬汁洗涤剂
pH10.27.06.82.512.2

A．柠檬汁的酸性比唾液弱

B．肥皂水能使紫色石蕊试液变蓝色

C．食盐水是中性物质

D．洗涤剂能使无色的酚酞试液变红色
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