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Since human beings(A) depend to(B) a great extent on forests, every effort must be made preserving(C) trees and wildlife(D).
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Dogs are similar to human beings in ______.
A．size
B．structure
C．temperament
D．appearance
We human beings usually express our thoughts ______ words.
A．through means of
B．by means of
C．through means of
D．by mean of
The killer bees should not be coming at all. Nature did not put them on this direct path for the United States; human beings did. The killer bees are from Africa. But in 1957 a scientist from Brazil got some of these killer bees for his experiments. The aim was to produce a better bee. However, an accident happened: a guest beekeeper let twenty-six of the queen bees escape by mistake. Before long, groups of killer bees took off for the woods.
Since that time, the wild killer bees have multiplied(繁衍) many times over. By 1998, their population was over 1015. They have spread all over South America, Central America, and most of Mexico. The United States is the next stop.
Are the killer bees really killers？ Yes, they are. In their first thirty years in America, they have killed thousands of hens, pigs, and other animals. While no one knows the exact number, it is believed that several hundred people have also been killed.
So be careful. Killer bees are on the way. Scientists have no idea what to do with them yet. There must be a way.
We know from the passage that killer bees will spread to the United States ______.
A．from north
B．from south
C．from west
D．from east
The whole passage implies that ________
A．only human beings have problem-solving intelligence
B．a person' s memory is different from a computer' s in every respect
C．animals are able to solve only very simple problems
D．animals solve problems by instincts rather than intelligence
Gestures, a body language of human beings, _________widely from culture to culture.
A． change
B． vary
C． differ
D． alternate
A．features
B．appearances
C．virtues
D．characteristics
Human beings should find a new _______ of energy. A. orientB. source C. origin D. souse
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.
A．they could do computations
B．they could work much faster than human beings
C．they looked like an abacus
D．they could remember data quickly
The order of coming into being on the island is ______.
A．soil, plants and animals
B．soil, little creatures and plants
C．soil, birds and plants
D．soil, human beings and animals
