问题 问答题

实验是进行科学探究的重要手段,请根据图示回答:

(1)图A中的主要错误是______.

(2)用图B装置除去CO2中的水蒸气则该液体药品是______.

(3)图C中若选择用硫磺做测定空气中氧气的体积分数,水可能不进入集气瓶原因是______.

答案

(1)做铁丝在氧气中燃烧的实验时,集气瓶中预先放少量水(或铺一层细沙),能够防止铁丝燃烧产生的高温熔融物溅落炸裂瓶底,故答案为:未在集气瓶内放少量水(或铺一层细沙).

(2)干燥气体常用氢氧化钠和浓硫酸,这里干燥的是二氧化碳气体,二氧化碳可以与氢氧化钠反应,所以只能用浓硫酸,故答案位:浓硫酸;

(3)硫燃烧生成二氧化硫气体,会占据硫燃烧消耗的氧气的体积,水不能进入集气瓶.故答案为:硫燃烧生成二氧化硫气体,会占据硫燃烧消耗的氧气的体积.

判断题
阅读理解

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。

D

People in Shanghai can quench their thirst with high quality water if the Shanghai Water Authority (SWA) is able to make good on its word. It has vowed to make the city’s water match its status as a world class city.

“The current tap water quality meets national standards, but, compared with that of the European Union and the United States, it still needs to be improved.” said the SWA’s director general, Hang Jiayi.

In other developed countries, water fountains can be found almost everywhere—people do not bother with bottled drinking water.

By 2020, the water of the Huangpu River will be treated to reduce the amount of organic waste in it. Major water works that draw water from the Huangpu will need more treatment facilities to improve the colour, texture, ammonia(氨)and nitrogen content before 2010.

These treatment facilities are expected to cost 4 billion yuan, something that could affect the price of water, according to Chen Yin, SWA’s deputy director general.

Chen said that replacing water pipes was also a key project. The city’s aged pipes are mostly to blame for the bad water quality.

The SWA has started the water facilities renovation(更新)work, including the more than 14,000 kilometres of indoor piping, 107,000 tanks on top of the buildings, and more than 6,000 underground facilities.

World Water Day came on March 22, and this year’s theme is “Water for the future”. Beijing is also drawing up plans during China’s Water Week, which runs until March 28.

By 2010, the water for the Shanghai EXPO is to be above World Health Organization standards. And, the people of Beijing will be able to drink their tap water as well.

小题1:People in Shanghai can drink their tap water_____.

A.by 2020

B.in the first half of this year

C.by 2010

D.by 2008小题2:What step need not be taken in order to improve the tap water?

A.The water of the Huangpu River will be treated.

B.Aged water pipes will be treated.

C.Water facilities must be renovated.

D.Water fountains must be found.小题3:Which is the correct statement according to the passage?

A.The tap water quality in Shanghai hasn’t met national standards.

B.World Water Day fell on March 22 this year.

C.The people of Beijing cannot drink their tap water now.

D.The treatment of the water of Huangpu River has been finished.小题4:What is the main idea of the passage?

A.The cost of treating the tap water.

B.How to reach the water standards of developed countries.

C.The project for making tap water drinkable in Shanghai and Beijing.

D.The progress of treating the water of Huangpu River.