Scientists say that many factors ______ great changes in the weather.A.brought aboutB.brou
Scientists say that many factors ______ great changes in the weather.
A.brought about
B.brought on
C.brought up
D.brought forward
Scientists say that many factors ______ great changes in the weather.
A.brought about
B.brought on
C.brought up
D.brought forward
Scientists say it may be ten years______this medicine was put to use.
A.since
B.before
C.after
D.when
Scientists say that many factors ______ changes in the weather.
A.bring in
B.bring off
C.bring about
D.bring forward
The article does not say whether the scientists' experiments with dogs have ______.
A.benefited animals other than dogs
B.served man
C.helped other dogs
D.contributed to medical knowledge
Scientists say it may be five or six years _____ this medicine is tested on human beings.
A.since
B.before
C.after
D.when
Scientists say that the salt in the ocean comes from______.
A.air
B.rocks
C.the earth
D.rain
Scientists say that many factors ______ changes in the weather.
A.bring in
B.bring off
C.bring about
D.bring forward
A.since
B.before
C.after
D.when
A.since
B.when
C.after
D.before
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