问题 选择题

实验室常采用点滴板来完成部分实验,既可节约药品,又便于观察实验现象。图中所示的实验现象描述正确的是(   )

①装有铜片的孔穴中溶液呈蓝色

②装有胆矾的孔穴中固体的颜色变浅

③装有铁片的孔穴中溶液呈浅绿色

④装有铁片的孔穴中溶液呈浅黄色

⑤装有蛋清溶液的孔穴中溶液呈黄色

A.①④

B.②③

C.①⑤

D.②⑤

答案

答案:D

题目分析::①浓硫酸与铜在加热条件下反应,不加热无现象,故①错误;②浓硫酸具有吸水性,可使胆矾失去结晶水,颜色变浅,故②正确;③浓硝酸具有强氧化性,在常温下与铁发生钝化,不能观察到绿色,故③错误;④浓硝酸具有强氧化性,在常温下与铁发生钝化,不能观察到黄色,故④错误;⑤浓硝酸与蛋白质发生显色反应,蛋白质变黄,故⑤正确.故选D.

阅读理解

Ⅳ.阅读理解(共15小题;每小题2分,满分30分)

阅读下列短文,从每题所给的四选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该选项涂黑。

A

There’s been a lot of talk about white-and-blue collar workers, and you may have even heard of gold collar workers, but lately a new color of collar is making its way into China’s urban vernacular(土话)—green. Green collars say no when work is life and life is work. They choose to get out of the fast lane(车道), and explore new ways of living “green”.

Living green doesn’t mean someone is working as an environmentalist, biologist or scientist. Instead it is more of a lifestyle choice. A typical green collar is well educated like a white-collar but physically tough like a blue-collar, likely born in the 70s or 80s of the last century and living in one of China’s big cities, with a monthly income well above 5,000 yuan (about US $700).

The life of a green collar may go something like this; Turn off the mobile phone after work, eat only healthy food rich in vitamins, go on hikes every weekend, and like to help the underprivileged. 

Green collars even have their own club. In Beijing, the Green Collar Club is for people who share a “be happy, healthy and helpful” spirit. The club often holds charity parties and uses the donations for environmental protection and poverty relief(摆脱贫困)projects in China.

“They are successful in their careers, but do not miss the pleasures in life. They have a lot of money, but do not fall slave to it.” said Zuo Shiguang, one of the founding members of the club.

1.What is the passage mainly about?

A.Differences between white-and-blue collars and green collars.

B.The increasing awareness of environmental protection.

C.New trends of life in China’s big cities.

D.The lifestyle of green collars.

2.Green collars are living green because_______.

A.they have a large income to use

B.they refuse to live an unhealthy life

C.they spend a lot of money and time in the open

D.they devote themselves to environmental protection

3.Green collars will_______after work.

A.prefer to be left alone

B.have fun with old friends

C.think nothing about work and more

D.do a lot of extra work at home

4.What ’s Zuo Shiguang’s attitude towards green collars?

A.Appreciative.   B.Doubtful.  C.Negative.  D.Neutral.

5.The underlined part “the underprivileged” probably refers to those who are_______.

A.in heavy polluted areas   B.in faraway places

C.in a poor state of education     D.in unfavourable conditions

判断题