若x和y都是buble型变量,且x的初值为3.0,y的初值为2.0,则表达式pow(y,fabs(x))的值为 【7】 。
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Why did Mr. Blue buy a camera
A. He wanted to photograph all the things in the shop.
B. He wanted to photograph anyone who broke into the shop at night.
C. He wanted to photograph his shop.
The way we feel about our mother’s behavior rather than her behavior may cause us distress.
Every year landslides (滑坡) cause 25 to 50 deaths and $1.5 billion in damage in the United States. They account for 15 percent of the deaths from natural disasters in Europe. And in December, a single event killed more than 200 people in the Philippines. Sending workers to stabilize mountainsides using steel bars and cement (水泥) can help prevent disaster, but it introduces new difficulties. Shaking drills produce harmful dust and loosen heavy, dangerous debris (岩屑). "It’s quite a risky job, "says Giorgio Pezzuto of D’Appolonia, an engineering company in Italy. D’Appolonia, working with eight other companies, may have an answer: a three-ton robot called Roboclimber. "The idea is to operate a machine far away that can drill without a human being on board," says Pezzuto, the manager for the project, which is supported by the European Commission. Engineers claim that the machine will be faster and cheaper than manual labor. The robot, a large radio-controlled four-legged mechanical spider, has cost at least $2 million so far. The final product should be able to climb unstable mountainsides, drill holes, insert bars and cement, and collect data on the stability. Testing should begin in May. What is the purpose in writing this text
A. Telling people how serious the damage caused by landslides is.
B. Telling people that sending workers to stabilize mountainsides is a risky job.
C. Introducing a product that can be used to stabilize mountainsides.
D. Showing people how to use a new product.
Most people have had a dog or wanted one as their companion at some time in their lives. If you are thinking of buying a dog, however, you should first decide what sort of companion you need and whether the dog is likely to be happy in your house. Specialists’ (专家) advice is useful to help you choose the most suitable kind of dog. But in part the decision depends on common sense. Different dogs were developed to perform specific tasks. So, if you want a dog to protect you, or your house, for example, you should choose the one that has the right size and characteristics. You must also be ready to devote (投入) a great deal of time to training the dog when it is young and give it the exercise it needs throughout its life, unless you live in the countryside and can let it run freely. Dogs are demanding pets. Cats love the house and so are satisfactory with their place where there is secure, but a dog is loyal to its master and consequently wants him to show proof of his affection. The first consideration in buying a dog is whether the dog is likely to be happy in the surroundings you can provide. The best time to buy a baby dog is when it is between 6 and 8 weeks old so that it can transfer its love from its mother to its master. If baby dogs have not established a relationship with the human being until they are over three months old, their strong relationship will always be with dogs. They are likely to be too shy when they are brought out into the world to be- come good pets. A dog is a more demanding pet than a cat because______.
A. it must be trained so that it won’t bite
B. it demands more food and space
C. it needs more love and care
D. it must be looked after carefully