题目内容
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A. occurs most infrequently
B. is shifted sideways by strong winds
C. is often hidden from our view
D. is equipped with a good knowledge of various forms of lightening
E. is estimated at 20 millions a year
F. is positively charged
In most cases of cloud-to-ground lightening, the ground's surface ______.
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A. held for sale with no depreciation taken.
B. held for use until disposal with no deprecation taken.
C. held for use until disposal with depreciation continuing to be taken.
On the basis of the passage, it would be most reasonable to infer that______.
A．the ancestors of horses and zebras were once members of the same species
B．the greatest biological change occurs in stable environments
C．individuals mutate when they need to adapt to a new environment
D．we can control population size by adapting new traits
The part-time job really takes up most of my spare time.
A) transfers
B)occurs
C) occupies
D)spends
On the basis of the passage, it would be most reasonable to infer that
A．the ancestors of horses and zebras were once members of the same species
B．the greatest biological change occurs in stable environments
C．individuals mutate when they need to adapt to a new environment
D．we can control population size by adapting new traits
A．it occurs over and over again
B．it changes whenever it jumps species
C．it is so catastrophic that it causes more death
D．it is mysterious and difficult to detect
The central problem in economics is that of______.
A．comparing the success of command versus market economies
B．guaranteeing that production occurs in the most efficient manner
C．guaranteeing a minimum level of income for every citizen
D．allocating scarce resources in such a manner that society's unlimited needs or wants are satisfied as well as possible
A．is not the worst of the negative consequences resulting from the use of pesticides
B．now occurs most frequently among all accidental deaths
C．has sharply increased so as to become the center of public attention
D．is unavoidable because people can't do without pesticides in farming
The author used the example of Coca-cola to show ______.
A．both the firm and the customers must be satisfied before trade occurs
B．a new product is hard to be accepted by the majority of the consumers
C．Classic Coke is much better than the new flavor produced by Coca-cola
D．a product must be designed to satisfy the demands of most consumers
