问题 选择题

下列变化规律中,不正确的是

A.金属Mg、Na、K的熔沸点由高到低

B.C1、Br、I的失电子能力由弱到强

C.H+、Li+、H的半径由小到大

D.物质SiO2、SiC、Si中共价键由弱到强

答案

答案:D

题目分析:A、金属键越强金属晶体的熔沸点越高,金属离子半径越小,电荷数越多,金属键越强,因此金属Mg、Na、K的熔沸点由高到低,A正确;B、非金属性越强,相应阴离子的还原性越弱,所以C1、Br、I的失电子能力由弱到强,B正确;C、核外电子层数越多微粒半径越大,核外电子排布相同的条件下原子序数越大,微粒半径越小,所以H+、Li+、H的半径由小到大,C正确;D、非金属性越强形成的共价键越强,因此物质SiO2、SiC、Si中共价键由强到弱,D不正确,答案选D。

阅读理解

Beijing—No Car Day was first started by 34 cities in France on September 22, 1998. It was started to protect the environment. By now, more than 1,000 cities around the world have had a No Car Day.

The first No Car Day in China was in Chengdu in 2001. Other cities, including Beijing, Taipei, Shanghai and Wuhan also support the day.

In Beijing, more and more people are joining in the activity. It asks drivers to leave their cars for one day each week and walk, take a bus or subway or ride a bike to work. The slogan(口号)for the activity is,“If we drive for one less day, we can have one more nice day.” Beijing is trying to have 238 blue sky days this year. In the first quarter of this year Beijing only have 52 blue sky days. This was 11 days less than the number for the same period last year. Car exhaust(汽车尾气) is one of the most important reasons of the pollution. We must do more for No Car Day.

So far, more than 200,000 drivers have shown their support. “We can’t control the weather, but we can choose not to drive.” said Wu Zonghua, a car club chairman.

小题1:There are_______ cities in China that support No Car Day according to the passage.

A.three

B.four

C.five

D.six小题2:The activity of No Car Day encourages Beijing drivers          .

A.not to work on No Car Day

B.to enjoy having a one-day holiday

C.to leave their cars at home to repair

D.to take a bus, or subway, ride a bike or walk instead of driving to work小题3:According to the passage there were           blue sky days in the first quarter of last year in Beijing..

A.52

B.63

C.41

D.238小题4:The air pollution in Beijing is mainly caused(导致)by           according to the passage.

A.cars

B.dust

C.weather

D.rubbish小题5:We can know from the passage that        .

A.more and more people in Beijing are joining car clubs

B.drivers should leave their cars for one day each month

C.more than 1,000 cities around the world have a No Car Day.

D.more people in the world won’t drive any more

单项选择题