更多"Ada, Beatrix and Collins have been "的相关试题:
[单项选择]Dogs have been man’s best friends (41) thousands of years. Many stories are told about how brave dogs helped the people (42) trouble. With the help of the dogs, many people lost in the snow were able (43) home.
Dogs have also helped in the research work in many fields of science. The first world’s space-traveler (44) a dog named Laika. It was (45) in a man-made earth (46) in 1957 by Russian scientists.
Dogs have been film stars, (47) . A dog called Lassie was the star in quite a few American films. Dogs can hear and smell (48) than man, but they can not see so well. A dog may (49) for about 12 or 13 years. A thirteen-year-old child is not (50) grown up, but a thirteen-year-old dog is a very old dog indeed.
A. since
B. for
C. in
[单项选择]Wherever people have been, they have left waste behind, which can cause all sorts of problems. Waste often stinks, attracts vermin and creates eyesores. More seriously, it can release harmful chemicals into the soil and water when dumped, or into the air when burned. And then there are some really nasty forms of industrial waste, such as spent nuclear fuel, for which no universally accepted disposal methods’ have thus far been developed.
Yet many also see waste as an opportunity. Getting rid of it all has become a huge global business. Rich countries spend some $120 billion a year disposing of their municipal waste alone and another $150 billion on industrial waste. The amount of waste that countries produce tends to grow in tandem with their economies, and especially with the rate of urbanization. So waste firms see a rich future in places such as China, India and Brazil, which at present spend only about $5 billion a year collecting and treating their municipal waste.
Waste
A. Waste is everywhere.
B. Waste is very harmful.
C. Waste should be treated universally.
D. Waste can be an opportunity.
[单项选择]Children have been said to have brain-injured child syndrome, hyperactive (极度活跃的) child syndrome and attention-deficit disorder (ADD). As early as the 1940’s, psychiatrists have (62) children with hyperactivity and extremely distracted and impulsive. These frequent name changes show how (63) researchers are about the causes of the problem and the diagnostic (诊断的) (64) for the disorders.
In the past several years, the people who study attention deficit hyperactivity disorder (ADHD) have (65) to clarify the disorder’s causes and (66) , and have reasons to believe that it may be (67) . Today’s view on this disorder is very different from the beliefs of just a few years ago.
Researchers are finding that ADHD is not a disorder of just attention, but is from a developmental (68) in the brain’s circuitry and self-control. The loss of self-control (69) other important brain functions compulsory
A. infectious
B. accessible
C. prone
D. inclined