Scientists have discovered that the ozone layer is getting thinner. Some predict that the sun’s rays will cause a sharp increase in deaths from skin cancer over the next fifty years. These harmful rays can also damage the eyes, create wrinkles, and cause other health problems. The stratosphere contains a form of oxygen called ozone. Ozone is a molecule composed of three oxygen atoms. The chemical formula of ozone is 03. Oxygen molecules make up about 21% of all gases in the Earth’s atmosphere. They consist of two atoms of oxygen and are labeled 02. Most ozone found in our atmosphere is formed by an interaction between oxygen molecules and ultraviolet radiation (UV) from the sun. When ultraviolet radiation hits an oxygen molecule, it may cause the molecule to break apart into single atoms of oxygen. These single atoms are very reactive, and a single oxygen atom can combine with a molecule of oxygen to form ozone.

Câu 31:

What do people say about the rate of deaths from skin cancer in the future?

A. It will decrease sharply

B. It will remain stable

C. It will increase sharply

D. It will flutate

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Câu 32:

How many oxygen atoms are there in an ozone molecule?

A. three oxygen atoms

B. two three oxygen atoms

C. a lot of oxygen atoms

D. no oxygen atoms

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Câu 33:

How is ozone formed in our atmosphere?

A. Two single atoms of oxygen interact each other.

B. Two oxygen molecules interact each other.

C. One oxygen molecule interact with one carbondioxide.

D. One single oxygen atom combines with a molecule of oxygen

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Câu 34:

What does the word “they” in the sencond parapraph refer to?

A. ozone molecules

B. gases

C. the Earth’s atsmosphere

D. oxygen molecules

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Câu 35:

The word “increase” in the first parapraph means …..

A. go down

C. stay unchanged

D. vary continuously

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4.6

1611 Đánh giá

50%

40%

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Danh sách câu hỏi:

Choose the word that has different stress pattern from the others.

Choose the word that has different stress pattern from the others.

Choose the word that has different stress pattern from the others.

Choose the word that has different stress pattern from the others.

Choose the best option to fill in the sentences. Circle your answer. It took firefighters five days to put out the _____.

Factories won’t dump waste into rivers if the government _____ them heavily.

What had you done before you _____ school yesterday?

. Every day we hear about new _____ in science and technology.

Ten new houses _____ in the town every year.

Olive said to Chau that she would leave Viet Nam _____.

I chose _____ by plane because it’s more convenient.

At three o’clock tomorrow, we _____ a video conference in our office.

_____ in Japan have found that human ageing may be able to be delayed or even reversed.

They said that they _____ a special TV which could perform two different channels at the same time.

Choose the most suitable response to complete each of following exchanges. “The forest fire was put out this morning. No one was killed.” – “____________!”.

“Would you like to go for a drink this weekend?” – “___________”

Choose the word OPPOSITE in meaning with the underlined word(s) in each of the following questions. In America, it’s not polite to ask questions about age, marriage and income.

Be quick! We must speed up if we don’t want to miss the flight.

Choose the word CLOSET in meaning with the underlined word(s) in each of the following questions. This river will soon become contaminated if people here keep dumping waste into it.

The factory is fined for discharging dangerous chmicals into the river.

Find a mistake in the four underlined parts of each of sentence. Nam said to Maria that he had visited his parents yesterday. A B C D

Tornadoes can be moved objects as big as a car. A B C D

Combine two sentences using the words in brackets. Plastic bags are a major source of waste. We should not throw plastic bags everywhere. (BECAUSE)

Try your best or you will never pass the examination. (IF) …………………………………………………………………………………

“At weekends, the astronauts can have video-conferences with their families” Dr. Nelson said. (COULD) …………………………………………………………………………………

She drinks contaminated water. She suffers from a serious disease. (IF) …………………………………………………………………………………

Complete the second sentence in each pair so that it has similar meaning to the first one. Volunteers have given out food and blankets to homeless people. → Food and blankets ……………………………………………………………………...

“I didn’t say anything at the meeting last week.” He said → He said that …………………………………………………………………………….

Some people will interview the new president on TV. → The new president ……………………………………………………………………..

“I have just received a birthday gift from my mother today.” Nick said to me. → Nick told me …………………………………………………………………………...

What do people say about the rate of deaths from skin cancer in the future?

How many oxygen atoms are there in an ozone molecule?

How is ozone formed in our atmosphere?

What does the word “they” in the sencond parapraph refer to?

The word “increase” in the first parapraph means …..

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Choose the best option to fill in the sentences. Circle your answer.

It took firefighters five days to put out the _____.

Choose the most suitable response to complete each of following exchanges.

“The forest fire was put out this morning. No one was killed.” – “____________!”.

Choose the word OPPOSITE in meaning with the underlined word(s) in each of the following questions.

In America, it’s not polite to ask questions about age, marriage and income.

Choose the word CLOSET in meaning with the underlined word(s) in each of the following questions.

This river will soon become contaminated if people here keep dumping waste into it.

Find a mistake in the four underlined parts of each of sentence.

Nam said to Maria that he had visited his parents yesterday.

A B C D

Tornadoes can be moved objects as big as a car.

A B C D

Combine two sentences using the words in brackets.

Plastic bags are a major source of waste. We should not throw plastic bags everywhere. (BECAUSE)

Try your best or you will never pass the examination. (IF)
…………………………………………………………………………………

“At weekends, the astronauts can have video-conferences with their families” Dr. Nelson said. (COULD)

…………………………………………………………………………………

She drinks contaminated water. She suffers from a serious disease. (IF)

…………………………………………………………………………………

Complete the second sentence in each pair so that it has similar meaning to the first one.

Volunteers have given out food and blankets to homeless people.
→ Food and blankets ……………………………………………………………………...

“I didn’t say anything at the meeting last week.” He said

→ He said that …………………………………………………………………………….

Some people will interview the new president on TV.
→ The new president ……………………………………………………………………..

“I have just received a birthday gift from my mother today.” Nick said to me.
→ Nick told me …………………………………………………………………………...