It's our to look after our parents when they get old. [ ]A. duty B. habit C. work D. problem 题目和参考答案——青夏教育精英家教网—

题目内容

It's our ______ to look after our parents when they get old.

[ ]

A. duty
B. habit
C. work
D. problem

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Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!
Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.
"We’ve learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."
British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.
But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It’s hard to get a clear result.
Will there be a better indicator than litmus paper? The three kids decided to try and find out!
How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.
The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best colour change. They decided it was the litmus paper!
"It’s our first scientific journey, Huang said, "But it makes me want to try harder."
【小题1】 Whom did the three kids want to challenge?

A．Their chemistry teacher.	B．Their headmaster.
C．Robert Boyle	D．Thomas Edison

【小题2】 From the text, a red cabbage is a kind of ____.

【小题3】What is widely used as the acid-base indicator now?

A．red cabbage	B．litmus paper
C．any plant	D．any flower

【小题4】The story mainly tells us ____.

A．how to make litmus paper	B．about the three kids’ spirit
C．scientists were wrong	D．the kids are heroes

Tigers are strong and dangerous animals. But now they are in danger.

In the past, there were eight kinds of tigers in the world. But during the 20th century, only five were left. The number of Siberian tigers (东北虎) was about 300, but now it is less than 22. They’re in danger of dying out. If the government does nothing, we won’t be able to see them in ten to twenty years.

In order to stop people from hunting and killing wild tigers, and in order to make wild tigers more, the World Wildlife Fund (世界自然基金会) has started a program (项目) recently (最近). China and twelve other countries joined it.

However, it’s not enough. Remember that nature is a food chain (链). If we hurt and kill too many wild deer and pigs, wild tigers will die out because of hunger (饥饿). So the most important thing is to save the animals that tigers eat. In order to protect the wild tigers, we need call on (号召) more people to stop eating, hunting and killing wild animals.

根据短文内容，选择正确答案。

1.During the 20th century, _______ kinds of wild tigers died out.

A. 3????????????? ????????????? B. 5????????????? C. 8????????????? ????????????? D. 20

2.The number of the wild Siberian tigers reduced (减少) about _______.

A. 5%????????????? B. 22????????????? C. 93%????????????? ????????????? D. 30%

3.Wild tigers will be in danger of dying out without _______.

A. pigs????????????? B. deer????????????? C. people????????????? D. A and B

4.Which of the following statements is NOT true?

A. There are less than 22 wild Siberian tigers now.

B. There are twelve countries in the World Wildlife Fund.

C. Wild tigers mainly feed on pigs and deer.

D. It’s our duty to protect the wild tigers.

5.The passage mainly tells us _______.

A. why and how do we protect the wild tigers

B. The government does everything they could to protect the wild tigers

C. the wild tigers will die out in ten to twenty years

D. the most important thing is to save the animals that tigers eat

In the universe,there is the earth,the moon,the sun,the stars and all the other things too far away to see.The earth is one of the sun’s 1 ,and the moon is our satellite.The moon is about three hundred and eighty thousand kilometers away 2 the earth ,but it’s our 3 neighbor in space.It 4 more than three days to get there by spaceship No man 5 fathar than the moon ,but spaceship 6 people has reached other planets.

Of 7 the stars ,the sun is the nearest to the earth 8 other stars are even bigger and brighter than the sun.They look small only 9 they are much farther away.You 10 see them in the daytime .But if you go out at night ,you’ll be able to see many of them.

A．Stars

B．planets

C．satellites

D．planet

A．over

B．below

C．down

D．from

A．nearer

B．the nearer

C．nearest

D．the nearest

A．takes

B．took

C．taken

D．taking

A．travel

B．travelled

C．has travelled

D．have travelled

A．with

B．without

C．for

D．to

A．all

B．some

C．many

D．any

A．Thousand of

B．Hundred of

C．Million of

D．Millions of

A．when

B．because

C．if

D．for

10.

A．must

B．mustn’t

C．can

D．can’t

Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!

Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.

"We've learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."

British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.

But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It's hard to get a clear result.

Will there be a better indicator than litmus paper? The three kids decided to try and find out!

How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.

The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best colour change. They decided it was the litmus paper!

"It's our first scientific journey, Huang said, "But it makes me want to try harder."

1. Whom did the three kids want to challenge?

A. Their chemistry teacher. B. Their headmaster.

C. Robert Boyle D. Thomas Edison

2. From the text, a red cabbage is a kind of ____.

A. plant　　B. animal　　C. paper　　D. liquid

3.What is widely used as the acid-base indicator now?

A. red cabbage B. litmus paper

C. any plant D. any flower

4.The story mainly tells us ____.

A. how to make litmus paper B. about the three kids' spirit

C. scientists were wrong D. the kids are heroes

Waste paper shouldn’t _____ everywhere. It’s our duty to keep our classroom clean.

A. be thrown B. throw C. is thrown

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