The factory produces half a million pairs of ...

The factory produces half a million pairs of shoes every day, 85% ____ sold abroad.

A. of them are    B. of them is     C. of which is    D. of which are

高三英语单项填空中等难度题查看答案及解析

The factory produces half a million pairs of shoes every year,80%________ are sold abroad.

A.  of them                B. which of                        C. of which                          D. of that

高三英语单项填空中等难度题查看答案及解析

The factory produces half a million pairs of shoes every year, _________ are sold abroad.

A. 80% of them     B. 80% of that              C. 80% of the shoes              D. 80% of which

高三英语单项填空简单题查看答案及解析

Plastic-Eating Worms

Humans produce more than 300 million tons of plastic every year. Almost half of that winds up in landfills(垃圾填埋场), and up to 12 million tons pollute the oceans. So far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.

Researchers in Spain and England recently found that the worms of the greater wax moth can break down polyethylene, which accounts for 40% of plastics. The team left 100 wax worms on a commercial polyethylene shopping bag for 12 hours, and the worms consumed and broke down about 92 milligrams, or almost 3% of it. To confirm that the worms’ chewing alone was not responsible for the polyethylene breakdown, the researchers made some worms into paste(糊状物) and applied it to plastic films. 14 hours later the films had lost 13% of their mass — apparently broken down by enzymes (酶) from the worms’ stomachs. Their findings were published in Current Biology in 2017.

Federica Bertocchini, co-author of the study, says the worms’ ability to break down their everyday food — beeswax — also allows them to break down plastic. ＂Wax is a complex mixture, but the basic bond in polyethylene, the carbon-carbon bond, is there as well, ＂she explains, ＂The wax worm evolved a method or system to break this bond. ＂

Jennifer DeBruyn, a microbiologist at the University of Tennessee, who was not involved in the study, says it is not surprising that such worms can break down polyethylene. But compared with previous studies, she finds the speed of breaking down in this one exciting. The next step, DeBruyn says, will be to identify the cause of the breakdown. Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?

Bertocchini agrees and hopes her team’s findings might one day help employ the enzyme to break down plastics in landfills. But she expects using the chemical in some kind of industrial process — not simply ＂millions of worms thrown on top of the plastic.＂

1.What can we learn about the worms in the study?

A.They take plastics as their everyday food.

B.They are newly evolved creatures.

C.They can consume plastics.

D.They wind up in landfills.

2.According to Jennifer DeBruyn, the next step of the study is to 　　　　　　　 .

A.identify other means of the breakdown

B.find out the source of the enzyme

C.confirm the research findings

D.increase the breakdown speed

3.It can be inferred from the last paragraph that the chemical might 　　　　　　　 .

A.help to raise worms

B.help make plastic bags

C.be used to clean the oceans

D.be produced in factories in future

4.What is the main purpose of the passage?

A.To explain a study method on worms.

B.To introduce the diet of a special worm.

C.To present a way to break down plastics.

D.To propose new means to keep eco-balance.

高三英语阅读理解困难题查看答案及解析

Plastic-Eating Worms

Humans produce more than 300 million tons of plastic every year. Almost half of that winds up in landfills(垃圾填埋场), and up to 12 million tons pollute the oceans. So far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.

Researchers in Spain and England recently found that the worms of the greater wax moth can break down polyethylene, which accounts for 40% of plastics. The team left 100 wax worms on a commercial polyethylene shopping bag for 12 hours, and the worms consumed and broke down about 92 milligrams, or almost 3% of it. To confirm that the worms’ chewing alone was not responsible for the polyethylene breakdown, the researchers made some worms into paste(糊状物) and applied it to plastic films. 14 hours later the films had lost 13% of their mass — apparently broken down by enzymes (酶) from the worms’ stomachs. Their findings were published in Current Biology in 2017.

Federica Bertocchini, co-author of the study, says the worms’ ability to break down their everyday food — beeswax — also allows them to break down plastic. ＂Wax is a complex mixture, but the basic bond in polyethylene, the carbon-carbon bond, is there as well, ＂she explains, ＂The wax worm evolved a method or system to break this bond. ＂

Jennifer DeBruyn, a microbiologist at the University of Tennessee, who was not involved in the study, says it is not surprising that such worms can break down polyethylene. But compared with previous studies, she finds the speed of breaking down in this one exciting. The next step, DeBruyn says, will be to identify the cause of the breakdown. Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?

Bertocchini agrees and hopes her team’s findings might one day help employ the enzyme to break down plastics in landfills. But she expects using the chemical in some kind of industrial process — not simply ＂millions of worms thrown on top of the plastic.＂

1.What can we learn about the worms in the study?

A.They take plastics as their everyday food.

B.They are newly evolved creatures.

C.They can consume plastics.

D.They wind up in landfills.

2.According to Jennifer DeBruyn, the next step of the study is to 　　　　　　　 .

A.identify other means of the breakdown

B.find out the source of the enzyme

C.confirm the research findings

D.increase the breakdown speed

3.It can be inferred from the last paragraph that the chemical might 　　　　　　　 .

A.help to raise worms

B.help make plastic bags

C.be used to clean the oceans

D.be produced in factories in future

4.What is the main purpose of the passage?

A.To explain a study method on worms.

B.To introduce the diet of a special worm.

C.To present a way to break down plastics.

D.To propose new means to keep eco-balance.

高三英语阅读理解困难题查看答案及解析

Which pair of shoes was comfortable?

A. The third pair.　　 B. The second pair.　　 C. The first pair.

高三英语短对话简单题查看答案及解析

Which pair of shoes was comfortable?

A. The second pair.　　 B. The third pair.　　 C. The first pair.

高三英语短对话中等难度题查看答案及解析

The other day I buy a pair of leather shoes in a shoe shop. The seller told me he would give “three guarantees” for the shoes. And only four days later, the shoes worn out. So I was angry and returned to the shop hoped to get my money back. I told the seller what had been happened to the shoes. When she knew that I had kept the shoes for four days, he refused, to which I was surprised. I asked him why he didn’t keep his promises. “Do you understand the ‘three guarantees’?” the seller said. “It means the shoes can only be kept in three days!” How a foolish explanation of the “three guarantees”!

高三英语短文改错中等难度题查看答案及解析

With the help of the high technology, this year the factory has produced ________ it did last year.

A．twice as many as　     B．twice as many cars as

C．twice as many as cars　     D．twice cars as many as

高三英语单项填空中等难度题查看答案及解析

— Jack has spent an hour in the shoe shop．Hasn't he decided which pair of shoes to buy?

— Maybe．Young as he is, he is________about his appearance．

高三英语单项填空简单题查看答案及解析