In recent years, scientists have reported that some uncertain factors disrupt the climate
A.Y
B.N
C.NG
A.Y
B.N
C.NG
In his book entitled () (1963), Derek J. de Solla Price analysed the recent system of science communication and thus presented the first systematic approach to the structure of modern science applied to the science as a whole.
A、“Little Science – Big Science”
B、Documentation
C、Human Behavior and the Principle of Least Effort
D、Citation analysis
In recent years, there have been over 30 foreign companies______business in this city.
A.doing
B.do
C.to do
D.done
Not until recent years ______ a popular means of communication.
A.e-mail became
B.e-mail has become
C.did e-mail become
D.will e-mail become
The milder winters of recent years make the pine beetle population ______.
A.decrease
B.increase
C.keep in check
D.change
In recent years, ______ is the main problem with housing.
A.the deterioration of housing conditions
B.the shortage in housing
C.the failures of construction programs
D.the reduction of housing subsides
A.result
B.climax
C.abyss
D.cultivation
In recent years there has been a ()increase in the cost of living; many familiar have to depend on the federal aids.
A、significant
B、violent
C、powerful
D、ponderous
Only in recent years ______ (人们才认识到节约用水多么重要).
A.264days
B.195days
C.239days
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