单项选择题

If the condor population has tripled since two decades ago, about how many are there now()

A. 90.
B. 60.
C. 33.
D. 300.

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填空题
A.true B.tune C.flute D.June
单项选择题
Which of the following is the best title of this passage()

A. Family.
B. American Families.
C. Family Types.
D. Four Family Types in America.
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