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问题 单项选择题

下列哪一项不是胃液盐酸的作用

A．激活胃蛋白酶
B．抑菌和杀菌
C．使食物中蛋白质变性
D．促进胰液、胆汁分泌
E．有利于小肠吸收钙和铁

答案

参考答案：A

解析：胃液中的盐酸可激活胃蛋白酶原，使转变为胃蛋白酶，并为胃蛋白酶作用提供所需的酸性环境。

阅读理解

阅读理解。

     Wen Jiabao is the premier of the world's most populous (人口众多的) country. But, millions of people

would rather call him "grandpa", Always in plain jackets, he seems an ordinary old man with a kind smile.

     Wen has visited the "left-behind" children before Children's Day. He visited Yang Saike's home,

a primary schoolboy in a village of Xingping County, Shanxi. Yang's parents were working in Fujian,

thousands of kilometers away. He was cared for by his grandparents. His parents fail to go home even

once a year. The premier held Yang in his arms and looked through his exercise book then praised him for

his hard work. When talked with many children and asked them many questions about their schooling and

 life. The premier asked the local governments to do something to protect and care for such children at

home and it their parents in cities not worry about their children.

     But in the face of disasters, he has the power to pull together the whole country. About two hours after

the deadly earthquake hit Sichuan Province, Permier Wen Jiabao was on a plane to the disaster area. Within

two days, he had seen almost all the worst hit cities and towns. The 65-year-old man was seen climbing

over damaged 26 buildings to encourage the trapped kids. And he shed (流泪) tears with sad families and

promised to help rebuild their homes.

1. Why do millions of people in China call Wen "grandpa"?  [ ]

A. Because he is the premier of the world's most populous country.

B. Because he is plain and seems an old ordinary old man with a kind smile.

C. Because he has the power to pull together the whole country.

D. Because he visited almost all the worst hit cities and towns.

2. What's the meaning of "left -behind" children?

[ ]

A. The children don't study hard, they fall behind others.

B The teachers often left the children behind.

C. The children always sit at the back of classroom.

D. The children's parents are working far away from them.

3. What did the premier do after he visited Yang Saike's home? [ ]

A. He held Yang in his arms.

B. He asked the local governments to care for the "left-behind' children.

C. He praised Yang for his hard work.

D. He shed tears with sad families.

4. Which of the following is NOT TRUE? [ ]

A. Yang Saike's parents usually go home after working.

B. Premier Wen has encouraged the whole nation to fight against the disasters.

C. Grandpa Wen always thinks of the people first.

D. The governments would do something to protect and care for people

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选择题

关于力下列说法正确的是 （    ）

A．力是使物体产生加速度的原因

B．物体只有受外力作用时才有惯性

C．物体的速度大惯性大

D．力是改变惯性的原因
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