The machine has been used for man years. It’s...

The machine has been used for man years. It’s no wonder that it doesn’t work well __________.

A. regularly　　　　　　　　　　 B. constantly

C. frequently　　 　　　　　 　　 D. occasionally

高三英语单项填空困难题查看答案及解析

The machine has been used many years. It’s no wonder that it doesn’t work well________.

A. regularly　　　 　　　　 B. constantly

C. occasionally　　　　 　 　 D. frequently

高三英语单项填空中等难度题查看答案及解析

The machine has been used many years. It’s no wonder that it doesn’t work well________.

A. regularly　　　　 B. constantly　　　 C. occasionally　　　　　 D. frequently

高三英语单项填空中等难度题查看答案及解析

For years, the automobile industry has been testing vehicles that use hydrogen as fuel. Now, people across the United States have had a chance to see and even drive cars that get power from hydrogen fuel cells (燃料电池).

But the hydrogen fuel cell is not a new idea. The fuel cell was first invented by Sir William Grove of Britain in 1839. Since then, many different designs, have been invented. There is one place where fuel cells are a proven technology: in space. The American space agency used fuel cells in its Apollo spaceships in the twentieth century.

The most useful fuel cell for transportation purposes is the Polymer Electrolyte Membrane, or P.E.M. fuel cell. It is simple and can operate at temperatures of sixty to eighty degrees Celsius. That is much lower than other fuel cell designs. A P.E.M. fuel cell has two sides divided by a thin membrane (膜). Hydrogen gas is forced through one side where it comes in contact with a reactive material containing the metal platinum(铂). The membrane separates the electrons(电子) from the protons(质子) in the hydrogen atoms. The protons pass through it to the other side of the fuel cell. But the electrons are captured to do work; like powering a motor. Oxygen from the air is forced into the other side of the fuel cell. There, the gas meets the protons that have passed through the membrane. They combine to form water and heat. A single fuel cell does not produce a lot of electricity. But when many fuel cells are combined, they can produce enough electricity to power a vehicle. The product of the chemical reaction that powers fuel cells is water. This makes fuel cells a very clean technology.

Hydrogen fuel cell cars have been slow to develop because of many technical problems that have to be solved. For example, it is unclear how long the membranes in P.E.M. fuel cells will last. Also, fuel cells need water for their chemical reactions. They must be designed to start easily at low temperatures and in dry climates. And smaller, less costly fuel cells must be designed before they can truly take the place of gasoline engines. Now more models of fuel cell vehicles are being tested than ever before. The threat of climate change and the high cost of oil have increased interest in these vehicles that do not cause pollution.

高三英语填空题中等难度题查看答案及解析

—The big clock has been used for many years.

—Well,　　 it doesn’t work well occasionally.

A.that’s because　　　　　 B.it’s no wonder that

C.there’s no doubt if　　 D.it’s unlikely that

高三英语单项填空中等难度题查看答案及解析

听下面一段较长对话，回答以下小题。

1.How long has the man been in the hospital?

A. For 2 years.　　 B. For 6 years.　　 C. For 7 years.

2.What will the man serve as in Nigeria?

A. An organizer.　　 B. A nurse.　　 C. A doctor.

3.What can we learn from the conversation?

A. The man got his new job this morning.

B. The woman is against the man's decision.

C. The man wants to marry Rosie.

高三英语长对话中等难度题查看答案及解析

An Australian man who has been donating his extremely rare kind of blood for 56 years has saved the lives of more than two million babies.

James Harrison has an antibody in his plasma（血浆）that stops babies dying from Rhesus disease, a form of severe anaemia. He has enabled countless mothers to give birth to healthy babies, including his own daughter, Tracey, who had a healthy son thanks to her father's blood.

Mr. Harrison has been giving blood every few weeks since he was 18 years old and has now racked up a total of 984 donations. When he started donating, his blood was deemed so special that his life was insured for one million Australian dollars.

He was also nicknamed the “man with the golden arm” or the “man in two million”. He said, “I've never thought about stopping. Never!” He made a pledge to be a donor aged 14 after undergoing major chest surgery in which he needed 13 liters of blood. “I was in hospital for three months,” he said. “The blood I received saved my life so I made a pledge to give blood when I was 18.”

Just after he started donating he was found to have the rare and life-saving antibody in his blood. At the time, thousands of babies in Australia were dying each year of Rhesus disease. Other newborns suffered permanent brain damage because of the condition. The disease creates an incompatibility between the mother's blood and her unborn baby's blood. It stems from one having Rh-positive blood and the other Rh-negative.

His blood has since led to the development of a vaccine called Anti-D. After his blood type was discovered, Mr. Harrison volunteered to undergo a series of tests to help develop the Anti-D vaccine. “They insured me for a million dollars so I knew my wife Barbara would be taken care of,” he said. “I wasn't scared. I was glad to help. I had to sign every form going and basically sign my life away.”

Mr. Harrison is Rh-negative and was given injections of Rh-positive blood. It was found his plasma could treat the condition and since then it has been given to hundreds of thousands of women. It has also been given to babies after they are born to stop them developing the disease.

It is estimated he has helped save 2.2 million babies so far. Mr. Harrison is still donating every few weeks now.

1.What does the underlined phrase “two million” refer to?

A．mothers          B．babies            C．dollars            D．blood

2.Why did James decide to donate his blood? Because _____.

A．his daughter asked him to help her son

B．he has a golden arm worth a million dollars

C．a vaccine called Anti-D is to be developed

D．someone else’s blood saved his life

3.The sentence “The disease creates an incompatibility between the mother's blood and her unborn baby's blood” (underlined in Paragraph 5) suggests that _____.

A．the mother and the baby have different types of blood

B．babies suffer permanent brain damage before born

C．Rhesus disease contributes to permanent brain damage

D．all the patients have a rare antibody in their blood

4.What can we infer from the sixth paragraph?

A．His wife Barbara needed to be taken care of badly then.

B．Mr. Harrison was not glad to help develop a new vaccine.

C．Some of the tests to develop the vaccine are dangerous.

D．His blood type was accidentally discovered after tests

高三英语阅读理解中等难度题查看答案及解析

An Australian man who has been donating his extremely rare kind of blood for 56 years has saved the lives of more than two million babies.

James Harrison has an antibody in his plasma that stops babies dying from Rhesus disease, a form of severe anaemia. He has enabled countless mothers to give birth to healthy babies, including his own daughter, Tracey, who had a healthy son thanks to her father's blood.

Mr. Harrison has been giving blood every few weeks since he was 18 years old and has now racked up a total of 984 donations. When he started donating, his blood was deemed so special that his life was insured for one million Australian dollars.

He was also nicknamed the “man with the golden arm” or the “man in two million”. He said: “I've never thought about stopping. Never.” He made a pledge to be a donor aged 14 after undergoing major chest surgery in which he needed 13 litres of blood. “I was in hospital for three months,” he said. “The blood I received saved my life so I made a pledge to give blood when I was 18.”

Just after he started donating he was found to have the rare and life-saving antibody in his blood. At the time, thousands of babies in Australia were dying each year of Rhesus disease. Other newborns suffered permanent brain damage because of the condition. The disease creates an incompatibility between the mother's blood and her unborn baby's blood. It stems from one having Rh-positive blood and the other Rh-negative.

His blood has since led to the development of a vaccine called Anti-D. After his blood type was discovered, Mr. Harrison volunteered to undergo a series of tests to help develop the Anti-D vaccine. “They insured me for a million dollars so I knew my wife Barbara would be taken care of,” he said. “I wasn't scared. I was glad to help. I had to sign every form going and basically sign my life away.”

Mr. Harrison is Rh-negative and was given injections of Rh-positive blood. It was found his plasma could treat the condition and since then it has been given to hundreds of thousands of women. It has also been given to babies after they are born to stop them developing the disease.

It is estimated he has helped save 2.2 million babies so far. Mr. Harrison is still donating every few weeks now.

1.How old is James Harrison？

A．56               B．70               C．74               D．78

2.What does the underlined phrase “two million” refer to?

A．dollars            B．babies            C．mothers          D．all of the above

3.Why did James decide to donate his blood? Because _____.

A．someone else’s blood saved his life

B．he has a golden arm worth a million dollars

C．a vaccine called Anti-D is to be developed

D．his daughter asked him to help her son

4.The sentence “The disease creates an incompatibility between the mother's blood and her unborn baby's blood” (underlined in Paragraph 5) suggests that _____.

A．all the patients have a rare antibody in their blood

B．babies suffer permanent brain damage before born

C．Rhesus disease contributes to permanent brain damage

D．. the mother and the baby have different types of blood

5.What can we infer from the sixth paragraph?

A．His wife Barbara needed to be taken care of badly then.

B．Some of the tests to develop the vaccine are dangerous.

C．Mr. Harrison was glad to help develop a new vaccine.

D．His blood type was accidentally discovered after tests.

高三英语阅读理解中等难度题查看答案及解析

An Australian man who has been donating his extremely rare kind of blood for 56 years has saved the lives of more than two million babies.

James Harrison has an antibody in his plasma that stops babies dying from Rhesus disease, a form of severe anaemia. He has enabled countless mothers to give birth to healthy babies, including his own daughter, Tracey, who had a healthy son thanks to her father's blood.

Mr. Harrison has been giving blood every few weeks since he was 18 years old and has now racked up a total of 984 donations. When he started donating, his blood was deemed so special that his life was insured for one million Australian dollars.

He was also nicknamed the “man with the golden arm” or the “man in two million”. He said: “I've never thought about stopping. Never.” He made a pledge to be a donor aged 14 after undergoing major chest surgery in which he needed 13 litres of blood. “I was in hospital for three months,” he said. “The blood I received saved my life so I made a pledge to give blood when I was 18.”

Just after he started donating he was found to have the rare and life-saving antibody in his blood. At the time, thousands of babies in Australia were dying each year of Rhesus disease. Other newborns suffered permanent brain damage because of the condition. The disease creates an incompatibility between the mother's blood and her unborn baby's blood. It stems from one having Rh-positive blood and the other Rh-negative.

His blood has since led to the development of a vaccine called Anti-D. After his blood type was discovered, Mr. Harrison volunteered to undergo a series of tests to help develop the Anti-D vaccine. “They insured me for a million dollars so I knew my wife Barbara would be taken care of,” he said. “I wasn't scared. I was glad to help. I had to sign every form going and basically sign my life away.”

Mr. Harrison is Rh-negative and was given injections of Rh-positive blood. It was found his plasma could treat the condition and since then it has been given to hundreds of thousands of women. It has also been given to babies after they are born to stop them developing the disease.

It is estimated he has helped save 2.2 million babies so far. Mr. Harrison is still donating every few weeks now.

1.How old is James Harrison？

2.What does the underlined phrase “two million” refer to?

3.   Why did James decide to donate his blood? Because _____.

4.The sentence “The disease creates an incompatibility between the mother's blood and her unborn baby's blood” (underlined in Paragraph 5) suggests that _____.

5.   What can we infer from the sixth paragraph?

高三英语阅读理解中等难度题查看答案及解析

The value of the U.S. penny has been dropping for years. Many countries have stopped using pennies. Is it time for the U.S. to do the same?

Those who think we should keep the U.S. penny offer the following arguments to support their positions:

Prices will increase. If we get rid of the penny, everything will have to be rounded to the nickel (五分硬币), costing us more for everything we buy.

Charities need pennies. There are thousands of small charities that depend on pennies to bring in donations. People think nothing of pouring out their old penny jars to support charity, but they won’t part with nickels so easily.

Nickels cost even more to make. If we get rid of the penny, we will need more nickels in circulation. Nickels cost 7.7 cents to make, 2.7 cents over face value, as opposed to 0.26 cents over face value to make a penny. Since the penny costs 0.26 more than face value to make, the Mint (铸币厂) can make 5 pennies and still lose less money than making 1 nickel.

People who want to retire the penny also have some persuasive arguments, including these:

Pennies waste time. The average American wastes 2.4 hours a year handling pennies, or waiting for people who handle them. This statistics is the result of collecting a number of penny-handling related events, including the 30-second period we sometimes spend waiting for someone who just has to dig through their pockets or purse to find that last cent so they can pay for something with exact change (probably so they don’t get stuck with any more pennies).

Making pennies wastes taxpayers’ money. It costs the U.S. Mint 1.26 cents to make each 1 cent coin, meaning that taxpayers are losing 0.26 of a cent for each one of the 7.4 billion pennies the Mint produces each year.

History will repeat itself. In 1857, the Mint stopped making the half-cent coin, partly because the cost of making it was considered to be no longer needed. Yet, commerce continued without any catastrophic effects. History has shown us that updating the monetary supply in countries where the currency (货币) is very stable has had little, if any, negative effect on the economy, or on people’s acceptance of the coinage.

1.According to people who want to keep the penny, getting rid of the penny 　　　　 .

A. is good for ordinary consumers

B. is especially bad for rich people

C. will be convenient for them

D. may lead to fewer donations to small charities

2.Why do pennies waste time?

A. Because consumers don’t always have enough change.

B. Because it takes time for people to get them from their pockets or purse.

C. Because pennies are not easy to take.

D. Because pennies are difficult to collect.

3.The underlined word “catastrophic” in the last paragraph can be replaced by “　　　　 ”.

A. direct　　 B. positive

C. important　　 D. disastrous

4.The text is mainly developed by 　　　　 .

A. giving examples

B. setting down general rules

C. comparing different opinions

D. following the natural time order

高三英语阅读理解中等难度题查看答案及解析