问题 选择题

区分日常生活中的下列各组物质,所加试剂或操作方法完全正确的是(    )

选项 需要区分的物质   所加试剂或操作方法
    A氯化铵与氯化钾   ①分别与熟石灰混合研磨②观察颜色
    B食盐和纯碱   ①加食醋 ②溶于水,滴加氢氧化钙溶液
    C氯化钠和亚硝酸钠   ①加水溶解,滴加酚酞试液,②尝味道
    D羊毛和涤纶   ①点燃,闻气味②观察色泽

答案

答案:B

A、氯化铵与氯化钾都是白色固体,观察颜色无法区别,故A错误;

B、碳酸钠能与酸反应生成二氧化碳,能与氢氧化钙反应生成碳酸钙沉淀,而氯化钠不具有此性质,故可以区别,故B正确;

C、氯化钠和亚硝酸钠都有咸味,尝味道区别不开,故C错误;

D、羊毛和涤纶外观色一样,观察色泽无法区别,故D错误,

故选B.

选择题
阅读理解

The common Chinese greeting of “Ni chi le ma?” may soon be  replaced (代替) by a new greeting: “Have you cleaned your plate?”

The Clean Your Plate Campaign(运动) began on the Internet in January, 2013. It calls on people to reduce food waste. China in recent years has experienced serious problems with wasted food. CCTV reported in January that the food Chinese people waste every year is enough to feed 200 million people for a year.

Chinese people are well-known for their friendly behavior towards guests. Many even feel that they lose face if their guests have eaten all the food.

It’s important for everyone to reduce food waste. However, wasting food is still a serious problem in China. We still have a long way to go.

President Xi Jinping is encouraging people to be less wasteful(浪费的), and he told Party members to cut back on wasteful holiday banquets(宴会). He said they should be more careful when spending the people’s money.

Wasting food certainly goes against what Xi Jinping calls, “the Chinese tradition of being hardworking and thrifty(节俭).” Having a “clean plate” is just a traditional and important thing to do.

小题1: The Clean Your Plate Campaign calls on people to ________.

A. reduce food waste           

B. be more friendly to guests  

C. deal with serious problems

小题2: Which of the following is True according to the passage?

A. The Clean Your Plate Campaign began online in January, 2013.

B. Chinese people waste food for 200 people in a year.

C. Chinese guests like to eat up all the food on the table.

小题3:We can learn from the passage that ________.

A. plates must be kept clean

B. Party members like to waste the people’s money

C. it’s difficult to deal with food wasting problem

小题4:The underlined phrase “cut back on” in the 5th paragraph(段落) probably means “________”.

A. 增加    B. 保持    C. 减少

小题5: The passage is written to ________.

A. introduce a new way of greeting

B. encourage people to be less wasteful

C. call on people to work hard for our country