题目内容

First (reported by) Spanish explorers in 1796, (the asphalt) in California’’s La Brea Tar Pit was mined (commercial) for (many) years.

A. reported by
B. the asphalt
C. commercial
D. many

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Meteorologists can program their computes to scan for a (specific), set of weather criteria, (such as)falling barometric pressure ,(Lincrease) cloud cover ,and rising (humidity).

A. specific
B. such as
C. increase
D. humidity

The migration of African Americans from the rural South to the (industrial) North in (the early) 1900’’s (were) the (biggest internal) migration in American history.

A. industrial
B. the early
C. were
D. biggest internal

Saturn takes almost 30 Earth years (to make) one trip around the Sun, (during) Jupiter takes about twelve Earth years (to complete) one solar (revolution).

A. to make
B. during
C. to complete
D. revolution

It may be argued that genetics, the (study) of heredity and variation, (underwent) the (most rapid) development of any (science biological) in the twentieth century.

A. study
B. underwent
C. most rapid
D. science biological