单选题The population of peregrine falcons declined rapidly during the 1950’s and 1960’s and reached an all-time low in the early 1970’s. The decline was attributed by scientists to the widespread use of the pesticide DDT in rural areas. Which of the following, if true, gives the strongest support to the scientists’ claim?A
DDT was not generally in use in areas devoted to heavy industry.B
In the time since the use of DDT was banned in 1972, the population of peregrine falcons has been steadily increasing.C
Peregrine falcons, like other birds of prey, abandon eggs that have fallen out of the nest, even if the eggs remain intact.D
Starlings, house sparrows, and blue jays-birds the peregrine falcon preys on were not adversely affected by DDT in their habitats.E
Other birds of prey, such as the osprey, the bald eagle, and the brown pelican, are found in the same areas as is the peregrine falcon.
第1题:
此题为判断题(对,错)。
第2题:
A、1940s
B、1950s
C、1970s
D、1960s
第3题:
A. cause
B. causing
C. caused
D. causes
第4题:
第5题:
第6题:
A.1940‘s
B.1950‘s
C.1960‘s
D.1970‘s
第7题:
in the 1950s and 1960s many australian writers thought that to gain a name they had to leave australia,and most went overseas to the u.s. ()
第8题:
A、causes
B、causing
C、caused
D、cause
第9题:
第10题:
The economic policy Britain pursued in the 1950s and 1960s was based on the theory of()
AAdam Smith
BJohn Maynard Keynes
CMargaret Thatcher
DKarl Marx