It was in 1990 ______ the medicine was tested on human patients.
A．since B．that C．before D．when
高二英语单项填空中等难度题
It was in 1990 ______ the medicine was tested on human patients.
A．since B．that C．before D．when
高二英语单项填空中等难度题查看答案及解析
Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.
| A．before | B．that | C．since | D．when |
高二英语单项填空中等难度题查看答案及解析
Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.
A．before B．after C． since D．when
高二英语单项填空简单题查看答案及解析
Scientists say it may be five years ______ it is possible to test this medicine on human patients．
A. since B. until C. before D. when
高二英语单项填空困难题查看答案及解析
It is uncertain ________ side effect the medicine will bring about, although about two thousand patients have taken it.
A. that B. what C. how D. whether
高二英语单项填空简单题查看答案及解析
Tu Youyou, 84, honored with the Nobel Prize in Physiology or Medicine on Oct 5, 2015. She was the first Chinese citizen to win a Nobel Prize in science for her work in helping to create an anti-malaria(疟疾) medicine.
In 1967, Communist leader Mao Zedong decided there was an urgent national need to find a cure for malaria. At the time, malaria spread by mosquitoes was killing Chinese soldiers fighting Americans in the jungles of northern Vietnam. A secret research unit was formed to find a cure for the illness. Two years later, Tu Youyou was instructed to become the new head of Mission 523. Researchers in Mission523 pored over ancient books to find historical methods of fighting malaria. When she started her search for an anti-malarial drug, over 240,000 compounds(化合物) around the world had already been tested, without any success.
Finally, the team found a brief reference to one substance, sweet wormwood（青蒿）, which had been used to treat malaria in China around 400 AD. The team isolated one active compound in wormwood, artemisinin（青蒿素）, which appeared to battle malaria-friendly parasites（寄生虫）. The team then tested extracts（提取物） of the compound but nothing was effective until Tu Youyou returned to the original ancient text. After another careful reading, she improved the drug recipe one final time, heating the extract without allowing it to reach boiling point.
After the drug showed promising results in mice and monkeys, Tu volunteered to be the first human recipient of the new drug. “As the head of the research group, I had the responsibility.” she explained.
1.When did Ms. Tu start her malaria research?
A. When she was 84 years old
B. After she entered “Mission 523”.
C. In 1967
D. When malaria become serious among ordinary Chinese people.
2.What can we learn about the discovery of anti-malaria drug?
A. The process of testing extracts of the compound is very smooth.
B. No one had ever done any research on it before Tu and her team.
C. The idea of using wormwood to treat malaria was from ancient Chinese text
D. Heating the extract until it reaches boiling point is necessary.
3. The underlined phrases “pore over” in paragraph 3 most probably means ________.
A. think about B. pay attention to
C. search for D. go over
4.Which of the following words can best describe Tu Youyou?
A. Responsible B. Traditional
C. Stubborn D. Lucky
高二英语阅读理解中等难度题查看答案及解析
In an ideal world，people would not test medicines on animals. Such experiments are stressful and sometimes painful for animals，and expensive and timeconsuming for people. Yet animal experimentation is still needed to help bridge vast gaps in medical knowledge. That is why there are some 50 to 100 million animals used in research around the world each year.
Europe，on the whole，has the world’s most restrictive(严格的) laws on animal experiments. Even so，its scientists use some 12 million animals a year，most of them mice and rats，for medical research. Official statistics show that just 1.1 million animals are used in research in America each year. But that is misleading. The American authorities do not think mice and rats are worth counting and，as these are the most common laboratory animals，the true figure is much higher. Japan and China have even less comprehensive（全面的） data than America.
Now Europe is reforming the rules governing animal experiments by restricting the number of animals used in labs. Alternatives to animal testing，such as using human tissue or computer models，are now strongly recommended. In addition，sharing all research results freely should help to reduce the number of animals for scientific use. At present，scientists often share only the results of successful experiments. If their findings do not fit the hypothesis（假设） being tested，the work never sees the light of day. This practice means wasting time，money，and animals’ lives in endlessly repeating the failed experiments.
Animal experimentation has taught humanity a great deal and saved countless lives. It needs to continue，even if that means animals sometimes suffer. Europe’s new measures should eventually both reduce the number of animals used in experiments and improve the way in which scientific research is conducted.
1.What is the main idea of this passage?
A. The success of animal experiments should be ensured.
B. A ban on the use of animals in the lab should be enforced.
C. Greater efforts need to be taken to reduce the number of lab animals.
D. Scientists should be required to share their research results with each other.
2.Which of the following statements is true about animals used in the lab?
A. America uses only about 1.1 million lab animals per year.
B. Europe does not use mice and rats as lab animals at all.
C. Britain does not use as many lab animals as China does.
D. Japan has limited data on the number of lab animals used each year.
3.Which of the following is mentioned as an alternative to replace animal experiments?
A. Statistical studies. B. Computer models.
C. DNA planted in animals. D. Tissue from dead animals.
4.What usually happens to unsuccessful animal experiments?
A. They are not made known to the public.
B. They are made into teaching materials.
C. They are collected for future publication.
D. They are not removed from the research topic list.
高二英语阅读理解中等难度题查看答案及解析
After years of research and testing, the hybrid car was developed and put on the market. It’s an interesting and exciting new improvement in today’s world as we look for better ways to protect the quality of the air we breathe and conserve our natural resources.
The quality of our air is affected by many different things. But one of the largest sources of air pollution is the burning of fossil fuels such as coal and gasoline which are used to power a car’s engine. The EPA has set national standards to help control the level of harmful pollutants sent off into the air, and the automobile industry has acted by producing a hybrid car that uses less gas and therefore causes less pollution.
A hybrid car is a combination of a regular car that runs on gasoline and an electric car that is battery powered. Some people tend to think that since the hybrid car is partially electric, you have to plug it in to charge it. But that’s not how it works. The 144 volt battery pack is actually recharged( 充电 ) through the energy that is produced when the car’s brakes are used. This is referred to as “regenerative braking”, because it generates electricity.
Although the hybrid car still runs on gasoline most of the time, this helps it use less gas than a regular car. When the driver stops at a traffic light, the engine automatically ( 自动地；机械地 )shuts off to save fuel. Then, as soon as the driver puts the car in gear and touches the gas pedal, the engine starts back up.
Have you ever ridden in a car with someone who ran out of gas? That probably wouldn’t happen if you were riding in a hybrid car. It flashes a warning on its computer screen that says, “I am low on gas”. When it completely runs out, the warning reads, “YOU ARE NOW OUT OF GAS!” Then the electric power supply kicks in to let the driver travel a few more miles to a gas station.
1.According to the passage, the word “hybrid” refers to ________.
A. a high tech discovery B. energy saving
C. a new invention D. a combination of two things
2.“Regenerative braking” is an important process of the hybrid car because ________.
A. it allows the car to come to a quick stop
B. it gives the driver a smoother ride
C. it produces energy to charge the battery
D. it can control the speed of the car
3.Which of the following is right about the EPA?
A. They designed hybrid cars.
B. They outlawed (宣布……为不合法) the burning of fossil fuels.
C. They set important guidelines that help control pollution.
D. Their main purpose is to protect endangered plants and animals.
4.Which of the following is the reason for developing hybrid cars?
A. They use less gas than regular cars.
B. They’re safer to drive than most cars.
C. They’re more modern than other cars.
D. They cost less than regular cars
高二英语阅读理解中等难度题查看答案及解析
In 1990 a report was published about 1the earth might be like 20 years from then on．The report was a result of a three-year study．
According to the report, the picture of the earth in the year 2010 is not a 2one．The world will be more 3because the population will continue to grow．The population could be 46,300 million, almost 2,500 million more than in 1985．More people would move into cities, 5cities in developing countries．Such cities as Cairo and Jakarta probably would 6have 15 million by then．
Food production will 7, but not enough to feed all the people．Farmers will grow 90% more food than they did in 1985, 8most of the increase would be in countries that 9produce enough food for their people． 10increase is expected in South Asia, Africa and the Middle East．Poor farming ways are 11large areas of crop land, changing farms into deserts．More farmland is 12as cities become larger and more houses are built． 13will get worse as industrial countries burn more coal and oil．Many of the world’s forests could disappear as more and more trees 14．Energy will continue to be a serious problem．The experts say their picture of the earth for the year 2010 15．They only pictured the situation that 16today．By changing the situation, by 17the problems, the picture can be changed．There is 18time for nations of the world to 19a plan of action．But they warned that 20too long to make decisions would greatly reduce the chances of success．
1.A．that B．whether C．how D．what
2.A．pleased B．pleasant C．safe D．clean
3.A．dangerous B．brilliant C．crowded D．awful
4.A．no more than B．as many as C．as much as D．as large as
5.A．especially B．specially C．deliberately D．apparently
6.A．none B．each C．all D．neither
7.A．insist B．reduce C．increase D．continue
8.A．so B．but C．or D．however
9.A．already B．hardly C．partly D．never
10.A．Much B．More C．Heavy D．Little
11.A．destroying B．protecting C．disturbing D．interrupting
12.A．saved B．lost C．discovered D．used
13.A．Air pollution B．Water pollution C．Some diseases D．All farmland
14.A．is cut across B．is cut up C．are cut down D．are cut off
15.A．must be true B．will come true C．can’t be true D．may be wrong
16.A．happens B．develops C．exists D．appears
17.A．settling B．working out C．answering D．dealing
18.A．much B．still C．less D．fewer
19.A．work about B．work at C．work out D．work for
20.A．working B．suggesting C．spending D．waiting
高二英语完形填空中等难度题查看答案及解析
It seems that this medicine has a good effect on the patient, ________he may die in great pain.
| A．when | B．where | C．by which | D．without which |
高二英语单项填空中等难度题查看答案及解析