It is silly of me _____ all eggs in one basket. That is the worst mistake I have made.
A. to put B. to have put C. put D. putting
高二英语单项填空中等难度题
It is silly of me _____ all eggs in one basket. That is the worst mistake I have made.
A. to put B. to have put C. put D. putting
高二英语单项填空中等难度题查看答案及解析
Of all my dreams, my least favorite is the one where I'm in a car. It always begins with me driving, but eventually I realize that for some reason I'm sitting in the back seat. I can’t keep the car under control, rushing toward the roadside until, screaming, I wake up.
This is like the passenger experience in Waymo's self-driving cars. You sit in the back seat of a vehicle and watch as the wheel turns itself above an entirely empty driving seat.
''We made you live your nightmare, '' a Waymo staff member joked after I exited one of the company's fully self-driving car, following a quick drive inside its secret testing site. Waymo, a self-driving car company, arranged these rides for 40 journalists at this site.
There were also some demonstrations(演示). We watched as a Waymo car was cut off by a speeding vehicle. Then the employees created a situation in which a pile of moving boxes fell into the street just as another car passed in the opposite direction. Throughout the day, the cars performed impressively, driving with the level of care you might take if you had a wedding cake in the back seat.
During these demonstrations, Waymo gave information about what it was planning to do with these vehicles. The company has laid out four ways that its technology could be made available to the public. But Waymo's CEO, John Krafcik, wouldn’t show which of these was likely to come to market first, or on what kind of timeline.
I can't help but admire that Waymo is succeeding in developing this technology. There are countless possibilities at play on the road. The task of programming software to react to all those situations is unimaginably complex. What a great breakthrough!
1.How did the author feel about her self-driving experience in her dream?
A.It was puzzling. B.It was terrifying.
C.It was amusing. D.It was inspiring.
2.The author is probably _______________.
A.a newspaper reporter B.a professional driver
C.a software developer D.a Waymo staff member
3.What did the author intend to prove by mentioning the wedding cake in paragraph 4?
A.The employees performed well.
B.The self-driving cars worked well.
C.The self-driving cars ran at the same speed.
D.People could depend on the cars in emergencies.
4.What can be inferred from the passage?
A.The self-driving car will come to market soon.
B.The programming software needs to be improved.
C.The technology will make a difference to people's life.
D.The company still has no plan to put the technology into practice.
高二英语阅读理解中等难度题查看答案及解析
It is known to all that ____ computer was invented in the USA.
A. that B. / C. the D. one
高二英语单项填空简单题查看答案及解析
A cellphone is one of the few things that we hold close to our faces all the time, and yet it could possibly explode - this is what made the recent Samsung’s Galaxy Note 7 smart-phone accidents so shocking.
According to technology news website The Verge, flawed（有瑕疵的）phone batteries might be to blame.
Even if you are not a science student, you probably know that it is common sense that the anode (the negative（负的）end of the battery) and the cathode (the positive end) should never touch. If they do, the battery will short-circuit（短路）, causing a powerful electrical reaction that can destroy the battery and cause a fire.
This is why all lithium-ion（锂离子）batteries - the kind that can be found in many of our devices like tablets and cameras - have a separator layer inside to stop the two ends from touching one another.
But somehow, the separators in some of the Samsung phones broke, causing explosions.
Overcharging is another problem that can make batteries heat up quickly. Fortunately, most batteries are designed to be able to automatically stop charging once they are fully charged. But again, this somehow failed to happen in some of the Samsung phones.
The two “somehows” may sound random（随机的）and hard to explain. But they actually both come from the fact that phone producers have been pushing the limits of batteries to meet customers’ demand for a longer battery life.
According to Lynden Archer, a materials scientist at Cornell University, US, we have already achieved 90 percent of the battery life possible from a lithium-ion battery. Customers’ demand that their devices get thinner has also given producers little choice but to try to put more power into thinner batteries.
“The more energy you put into a box, the more dangerous it’s going to be,” Billy Wu, a lecturer at Imperial College London, told The Guardian.
A thinner battery also means producers have to use thinner material for separators, and thinner material has more chance of breaking.
1.A separator layer is put in lithium-ion batteries in order to ___________.
A. ensure a longer battery life
B. prevent a battery from short circuiting
C. connect the anode and the cathode
D. reduce a certain electrical reaction
2.What are the direct reasons for the Samsung phone explosions?
A. Short circuiting and overheating
B. Pushing the limits of batteries
C. Overcharging and thinner batteries
D. Automatic charging and broken separators
3.Lynden Archer’s comments indicate that ___________.
A. demands for thinner cellphones are unreasonable
B. lithium-ion batteries can’t hold much more power than that they do now
C. producers can use 10 percent of a lithium-ion battery
D. new material for batteries is needed to meet consumers’ demands
4.What is the writer’s main purpose of writing the article?
A. To describe problems facing cellphone producers
B. To explain the reasons for the Samsung phone explosions
C. To teach us common sense when it comes to batteries
D. To warn us about the dangers of lithium-ion batteries
高二英语阅读理解中等难度题查看答案及解析
It is hoped that one day all the wild animals shut up in the cages will be set free to nature and live happily in wild.
A. / ; the B. the; / C. the; the D. a; /
高二英语单项填空中等难度题查看答案及解析
It is one of the greatest mysteries of nature. In case you haven’t noticed, all living things follow very definite, individual rhythms, all as regular as a clock, but what makes them regular?
Though many scientists maintain that these rhythms are the result of some outside force like gravity or radiation or both, the results of most scientific researches agree with other scientists who believe that each living thing has its own built-in biological “time clock.”
Take the mystery of migration for example. Scientists can’t really explain why many species of birds migrate in the autumn even though the temperature is still summery. The birds just seem to snub the comfortable weather that they are having. When a certain time comes, they travel south by the thousand. In spring time, they migrate northwards when though there probably is snow still covering the ground when they finally arrive. Something said “go”, and they did.
Animals that hibernate are obeying individual time clock, too. When their clock indicates the time to take a winter’s nap, they do, and nothing can stop them. At a certain time in the spring, they wake up and come out regardless of the weather outside.
Plants appear to have yearly rhythms, such as the sprouting(发芽)of seeds, and they also have daily rhythms. Notice sometimes that plants raise their leaves in daylight and lower them at night.
If you live along the California coast, you can easily observe a demonstration of this mysterious clock functioning regularly. There, from February to September, the highest tides occur exactly every fourteen and four-fifths days, and during these high tides, but at no other time, small silvery fish called grunions surf-ride a wave to the beach. There the female deposits her eggs in the sand and the male, fertilize them; then both hitch a wave-ride back to the sea. Exactly fourteen and four-fifths days later, never before or after, the tiny eggs hatch, and the high tide carries the new habits out to sea.
1.According to the passage, the mysterious rhythms result from ________.
A.the influence of gravity on living species
B.the effect of radiation on living species
C.the influence of a mysterious outer force on living species
D.the internal mechanism inside the living species
2.The underlined word “snub” in the third paragraph probably means ________.
A.fight B.ignore
C.symbolize D.criticize
3.Which of the following statements is NOT TRUE?
A.Hibernating animals are obeying an internal time clock.
B.The positioning of the leaves of some plants is due to the daily rhythms.
C.The internal clock functioning is demonstrated in the reproducing habits of grunions.
D.The yearly hibernation is more because of the weather influence than the biological functioning.
4.The passage is mainly about ________.
A.the rhythms of life B.the reasons of mysterious hibermation
C.strange behaviors of species D.the timing for different events in the world of species
高二英语阅读理解中等难度题查看答案及解析
It ______ me all of a sudden that I had left my key to the car in the office.
A．thought B．struck C．happened D．occurred
高二英语单项填空中等难度题查看答案及解析
There are many superstitions(迷信) in Britain, but one of the most widelyheld is that it is unlucky to walk under a ladder—even if it means stepping off the pavement into a busy street!
①Walking under a ladder
If you must walk under a ladder you can avoid bad luck by crossing your fingers and keeping them crossed until you've seen a dog. Alternatively, you must lick your finger and make a cross on the toe of your shoe, and not look again at the shoe until the mark has dried.
②Umbrella
Another common superstition is that it is unlucky to open an umbrella in the house—it will either bring misfortune to the person that opened it or to the household. The superstition could date from the old time when its purpose was to act as a sunshade. If opened indoors, it might be considered to be an attack on the sun. Anyone opening an umbrella indoors in fine weather is unpopular, as it inevitably brings rain!
③Number 13
The number 13 is said to be unlucky for some, and when the 13th day of the month falls on a Friday, anyone wishing to avoid an inauspicious event had better stay indoors.
④Seven years bad luck
The worst misfortune that can befall you is caused by breaking a mirror, as it brings seven years of bad luck! The superstition is supposed to have originated in ancient times, when mirrors were considered to be tools of the gods.
⑤Black cat
In the UK, black cats are generally considered lucky in the UK, even though they are connected with witchcraft(巫术)：You are said to be lucky if a black cat crosses your path.
1.Which experience is considered to be lucky according to the passage?
A. walking under a ladder
B. opening an umbrella in the house
C. breaking a mirror
D. a black cat crossing your path
2.Which of the followings is RIGHT in UK according to the passage?
A. Opening an umbrella in the rain is not acceptable or unpopular.
B. Black cats are generally considered unlucky because they have something with witchcraft.
C. Bad luck brought by walking under a ladder cannot be avoided using certain ways.
D. If you are to open a clothes store on May 13 in Britain, you had better change the date.
3.Which two superstitions are related to history?
A. ①② B. ②④
C. ④⑤ D. ③④
4.It can be inferred from the passage that ________.
A. breaking a mirror will cause bad luck because it shows your disrespect(不敬)for the God
B. crossing your fingers and keeping them crossed can help avoid bad luck brought by walking under a ladder
C. number 13 is always unlucky in any situation
D. opening an umbrella indoors might be considered to be an attack on the sun
高二英语阅读理解中等难度题查看答案及解析
John is the only one of the students in the class that never _______ a mistake even when it is pointed to him.
A. admit making B. admits making
C. admit to make D. admits to make
高二英语单项填空中等难度题查看答案及解析
The population of China is larger than ______ of any other country in the world.
A. that B. it C. one D. this
高二英语单项填空中等难度题查看答案及解析