问题 选择题

下列对实验现象的描述,不符合实验事实的是(  )

A.铁在氧气中燃烧时,发出黄白色火焰,火星四射,生成黑色固体

B.向某种无色碳酸饮料中滴入紫色石蕊试液,试液变红

C.磷在空气中燃烧,产生浓厚的白烟

D.点燃氢气和氧气的混合气体可能发生爆炸

答案

A、铁丝在氧气中剧烈燃烧,火星四射,放出大量的热,生成一种黑色固体,故选项说法错误.

B、紫色石蕊溶液遇酸性溶液变红,遇碱性溶液变蓝;碳酸显酸性,向某种无色碳酸饮料中滴入紫色石蕊试液,试液变红,故选项说法正确.

C、磷在空气中燃烧,产生浓厚的白烟,故选项说法正确.

D、氢气具有可燃性,点燃氢气和氧气的混合气体可能发生爆炸,故选项说法正确.

故选A.

阅读理解

Half a century after the March of Dimes (a US charity organization that collects money for children) put the 20th century’s most feared childhood disease on the road to eradication (根除), Bill Gates declared polio (小儿麻痹症) his important job and challenged world leaders to finish the job.

India, Nigeria, Pakistan and Afghanistan now have active transmission (传播) of the disease. Gates says the biggest problem with the success of the Global Polio Eradication program in those countries and elsewhere is lack of money.

The Bill and Melinda Gates Foundation plans to increase its $200 million annual contribution (每年的捐款) by $102 million this year, Gates says. Gates recently met privately with Pakistan’s President in Washington, D.C., to try to persuade him to provide full support for Pakistan’s eradication plan.

Children in the USA also are at risk, experts say. Parents who don’t vaccinate (给某人接种疫苗) their children because they are fearful of vaccine side-effects create a large number of children who are likely to be harmed by the virus.

“If you increase the number of unvaccinated children, you increase the chance that this virus will find new subjects,” says David Oshinsky, Pulitzer Prized-winning author of Polio: An American Story.

“We’ve got to get this vaccine into the mouths of children,” says Bruce Aylward, head of the World Health Organization’s eradication program.

In 1988, when the World Health Organization launched the Global Polio Eradication program, the disease killed 350,000 children a year worldwide. By last year, the total dropped to fewer than 1,500 worldwide, Aylward says.

If Gates provides the final push for polio eradication, he may be remembered as much for helping prevent polio as for founding Microsoft, Oshinsky says.

“As long as there’s polio anywhere, people everywhere are at risk,” Aylawrd says. “We’re still not out of the woods.”

小题1:According to the text, the success of the Global Polio Eradication program mainly depends on          .

A.the World Health Organization’s policy

B.the development of a new vaccine

C.the local governments’ support

D.the collection of funds.小题2:What do we know about polio according to the text?

A.People in Nigeria don’t take it seriously.

B.It’s now the most serious childhood disease.

C.Great progress has been made in preventing it.

D.There are few organizations helping to prevent it.小题3:According to Oshinsky,           .

A.Gates should devote more time to Microsoft

B.polio eradication is a very important cause

C.vaccine side-effects should not be ignored

D.polio has been brought under control小题4:According to the passage, which of the following about Bill Gates is TRUE?

A.He is the founder of the Global polio Eradication program.

B.He persuades some of the world leaders to support the eradication plan.

C.His foundation contributes $302, 000 to eradicate polio every year.

D.He works harder on preventing polio than founding Microsoft.小题5:The underlined part “We’re still not out of the woods” means “       ”.

A.We get lost in the woods

B.We’re not free from trouble

C.we have no idea where to go

D.We’re unable to eradicate polio

单项选择题