题目内容
（请给出正确答案）
Why does it take long for people to change their food？
A． Because labs are not easily accessible to researchers.
B． Because some people are reluctant to accept the new diet.
C． Because food consumption is a culture of conservation.
D． Because some scientists are against the growing lab meat.
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更多“Why does it take long for peop…”相关的问题
A.Although full backups are more thorough but they take more time to perform. and slow down other system services.
B.Incremental backups take less time to load than full back ups.
C.Incremental backups offer better data recovery rates than full backups.
D.Linux does not accommodate full backups daily.
It was Monday, Mrs. Smith's dog was hungry, but there was not any meat in the house.
Considering that there was no better way, Mrs. Smith took a piece of paper, and wrote the following words on it, "Give my dog half a pound of meat." Then she gave the paper to her dog and said gently, "Take this to the butcher (卖肉者) , and he's going to give you your lunch today."
Holding the piece of paper in its mouth, the dog ran to the butcher's shop. It gave the paper to the butcher. The butcher read it carefully, recognized that it was really the lady's handwriting and presently did as he was asked to. The dog was very happy, and ate the meat up immediately.
At midday (正午), the dog came to the shop again. It gave the butcher a piece of paper again. After reading it, he gave it half a pound of meat once more.
The next day, the dog came again exactly at midday. And as usual it brought a piece of paper in. the mouth. This time, the butcher did not take a look at the paper, and gave the dog its meat, for he had regarded the dog as one of his customers.
But, the dog came again at four o'clock. And the same thing happened once again. To the butcher's more surprise, it came for the third time at six o'clock, and brought with it a third piece of paper. The butcher felt a bit puzzled. He said to himself, "This is a small dog. Why does Mrs. Smith give it so much meat to eat today？"
Looking at the piece' of paper, he found that there were not any words on it!
Mrs. Smith treated her little dog quite ______.
A．cruelly
B．kindly
C．badly
D．unfairly
The marvel of the machine age, the electronic computer has been in use only since 1946. It can do simple computations—add, subtract, multiply, and divide—with lightning speed and perfect accuracy. It can multiply two 10-digit numbers in 1/1, 000 second, a problem that would take an average person five minutes to do with pencil and paper. Some computers can work 500, 000 times faster than any person can.
Once it is given a program, that is, a carefully worked-out set of instructions devised by a technician trained in computer language, a computer can gather a wide range of information for many purposes. For the scientist it can get information from outer space or from the depths of the ocean. In business and industry the computer prepares factory inventories, keeps track of sales trends and production needs, mails dividend checks, and makes out company payrolls. It can keep bank accounts up to date and make out electric bills. If you are planning a trip by plane, the computer will find out what route to take and what space is available.
Why does the author regard the electronic computer as the marvel of the machine age？
A．Because electronic computers are rare.
B．Because people know little about electronic computers.
C．Because electronic computers can do much more kinds of work that human beings can't.
D．Because electronic computers have been widely suspected.
Sophie: Why don't you take your friends to the football game？
Keith: ______
A．I don't think it's a clever idea.
B．Can't you think of anything better？
C．Well, they are not really football fans.
D．Nothing is worse than this. They hate football.
According to the passage, why does a drink bring serious results to a smoker？
A．Because it may act as a dissolving agent.
B．Because he is malnourished.
C．Because the liver can't dispose of alcohol
D．Because the liver has to clean the toxins.
The reason why people who have friends live longer than people who don't is that ______.
A．they get a lot of help from their friend move away.
B．they feel happier and take better care of themselves
C．they take better care of their friends
D．their friends can teach them how to live a longer life
Why does the author mention bees，ants，toads，and turtles in the last paragraph？
A.To describe some unusual kinds of pets．
B.To measure distances trailed by various animals．
C.To compare their home-finding abilities with those of homing pigeons．
D.To interest the reader in learning about other animals．
