I missed supper_______ I’m starving!
A.but B.and C.or D.for
高三英语单项填空中等难度题
I missed supper_______ I’m starving!
A.but B.and C.or D.for
高三英语单项填空中等难度题查看答案及解析
Hurry up, __________ we will miss the train.
A.but | B.and | C.or | D.so |
高三英语单项填空简单题查看答案及解析
Start out right away, _____ you’ll miss the first train.
A. and B. but C. or D. while
高三英语单项填空中等难度题查看答案及解析
Start out right away, ________ you'll miss the first train.
A. and B. but C. or D. while
高三英语单项填空中等难度题查看答案及解析
Not long ago, making a baby boy or a baby girl was pretty much a hit-or-miss affair, but not any more now. Parents who have accuracy, as Monique and Scott Collins learned to their delight two years ago, when their long-wished-for daughter Jessica was born after genetic pre-screening at a fertility clinic in Fairfax, Virginia.
And baby Jessica is just the beginning. Within a decade or two, it may be possible to screen kids almost before pregnancy(怀孕) , such as how tall they are likely to be, what baby type they will have, their hair and eye color, and even their IQ and personality types.
In fact , if gene therapy lives up to its promise, parents may some day be able to go beyond weeding out undesirable trials and start actually inserting the genes they want, perhaps even genes that have been crafted in a lab. Parents may be going to fertility clinics and picking from a list of choices the way car buyers order air conditioning or wheels. “It’s the most exciting shopping” experience designing your baby.” says biotechnology(生物工艺学) critic, Jeremy Rifkin, who is concerned about the prospect(前景). “In a society that is used to cosmetic surgery(整形手术), this is not a big step.”
The prospect of designer babies, like many of the ethical(伦理)problems caused by the genetic revolution, is causing the doctors, ethicists, religious leaders and politicians of the whole world to start a fierce conflict , who are trying to decide how they feel about it all.
They still have a bit of time. Apart from gender, the only trails that can now be identified at the earliest stages of development are about a dozen of the most serious genetic diseases. Gene therapy in embryos(胚胎) is at least a few years away. And the gene or combination of genes responsible for most of our physical and mental attributes hasn’t even been identified yet, so the idea of engineering genes in or out is of no practical meaning.
1.What is gene therapy supposed to do if it lives up to its promise?
A.Screen a baby for sex. B. Choose a baby’ s eve color.
C. Implant genes. D. Identify genetic disorder.
2.According to the passage , what scientists can do with the genetic testing technology now is to_______.
A.screen a baby’s sex B.screen babies for desirable qualities
C.put in genes parents want D.craft genes in a lab
3.What can best describe Jeremy Rifkin’s attitude toward designing babies through gene therapy?
A.Strongly supportive B. Warmly welcome.
C.Uninterested. D. Critical.
4.From the passage we know that________.
A.designing babies is purely scientific not to cause ethical problems
B.designing babies may bring people a lot of ethical concerns
C.scientists are now working against time to design babies
D. people are concerned about the harm clone to science by designing babies
高三英语阅读理解中等难度题查看答案及解析
Everybody sleeps, but what people stay up late to catch—or wake up early in order not to miss—varies by culture. From data collected, it seems the things that cause us to lose the most sleep, on average, are sporting events, time changes, and holidays.
Around the world, people changed sleep patterns thanks to the start or end of daylight savings time. Russians, for example, began to wake up about a half-hour later each day after President Vladimir Putin shifted the country permanently to “winter time”starting on October 36.
Russia’s other late nights and early mornings generally correspond to public holidays. On New Year’s Eve, Russians have the world’s latest bedtime, hitting the hay at around 3:30 am.
Russians also get up an hour later on International Women’s Day, the day for treating and celebrating female relatives.
Similarly, Americans’ late nights late mornings, and longest sleeps fall on three-day weekends.
Canada got the least sleep of the year the night it beat Sweden in the Olympic hockey(冰球)final.
The World Cup is also chiefly responsible for sleep deprivation(剥夺), The worst night for sleep in the U.K. was the night of the England-Italy match on June 15. Brits stayed up a half-hour later to watch it, and then they woke up earlier than usual the next morning thanks to summer nights, the phenomenon in which the sun barely sets in northern countries in the summertime. That was nothing, though, compared to Germans, Italians, and the French, who stayed up around an hour and a half later on various days throughout the summer to watch the Cup.
It should be made clear that not everyone has a device to record their sleep patterns, in some of these nations, it’s likely that only the richest people do. And people who elect to track their sleep may try to get more sleep than the average person. Even if that’s the case, though, the above findings are still striking, If the most health-conscious among us have such deep swings in our shut-eye levels throughout the year, how much sleep are the rest of us losing?
1.What does the author say about people’s sleeping habits?
A. They are culture-related .
B. They affect people’s health
C.They change with the seasons.
D.They vary from person to person.
2.What do we learn about the Russians regarding sleep?
A. They don’t sleep much on weekends.
B. They get less sleep on public holidays
C.They don’t fall asleep until very late.
D.They sleep longer than people elsewhere.
3.What is the most probable reason for some rich people to use a device to record their patterns?
A. They are involved in a sleep research.
B. They have trouble falling asleep.
C. They want to get sufficient sleep.
D. They want to go to bed on regular hours.
4. What does the author imply in the last paragraph?
A. Sleeplessness does harm to people’s health.
B. Few people really know the importance of sleep.
C. It is important to study our sleep patterns.
D.Average people probably sleep less than the rich.
高三英语阅读理解中等难度题查看答案及解析
Jane didn’t get to the airport on time, ______she missed the plane.
A.but | B.for | C.so | D.Or |
高三英语单项填空简单题查看答案及解析
They tell us when to get up or when we’re running late for work and whether we are in danger of missing our favourite TV programme. But while our daily routines rely on clocks that tell us the time, science is discovering that our well-being is influenced by a very different kind of timepiece. Circadian rhythms---the human body’s own internal clock---have a powerful influence on our health and behaviour. They are programmed from birth and control functions ranging from temperature and blood pressure to sleep patterns.
In recent years researchers have also discovered that this built-in mechanism can influence everything from the way we react to medicines to how well we learn music.
The latest example, from experts at Harvard University in the US, shows that the human body clock can even dictate whether or not we are likely to tell the truth. Researchers found it was easier for people to fib(撒小谎) in the afternoon because, as they were tired, the self control that would normally prevent them from lying started to break down. Tiredness made it harder to resist the temptation to tell lies---especially if it meant they got a financial reward at the end.
“The body clock has a great effect on us all,” says Professor Jim Horne from the Sleep Research Centre at Loughborough University. “Most people tend to feel good around late morning and then decline in the early afternoon. But the time most of us will feel our sharpest is between 6pm and 8pm. That’s because sleepiness tends to build up throughout the day. By early evening our body clock kicks in to wake us up. One reason may be to ensure we get home safely. When our ancestors were coming home after hunting all day their internal clocks kicked in to get them home in one piece.”
So what effects do circadian rhythms have and what’s the best time of day to take advantage of them?
1.The underlined word “They” in the first paragraph refers to .
A. our clocks B. scientists and experts
C. our daily routines D. circadian rhythms
2.The research referred to in Paragraph 3 found that people tend to .
A. tell lies when they are tired
B. tell lies if they are rewarded
C. lose temper as they become tired
D. break down because they are tired
3. According to the passage, when are people most quick-thinking?
A. In the morning. B. Around midday.
C. In the late afternoon. D. In the early evening.
4.What information will the writer probably present following the last paragraph?
A. Some practical suggestions to prevent people from lying.
B. Examples of how the human body clocks control the body.
C. Examples of the most suitable time to do different activities.
D. An explanation of how the human body clock controls the body.
5. What is the best title for the passage?
A. Rebuild your body clock B. Timing is everything
C. Sleep more, lie less D. Your time is limited
高三英语阅读理解中等难度题查看答案及解析
Hurry up, ________ you will miss the train. It's leaving in ten minutes.
A.and | B.so | C.however | D.or |
高三英语单项填空简单题查看答案及解析
—Bread _____butter?
—Bread ______no butter, thanks a lot.
A. or;and B. and;but C. or;but D. and;and
高三英语单项填空中等难度题查看答案及解析