单项选择题

Today there are about seven （）Americans in colleges and universities

A.millions
B.million
C.millions of
D.million of

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单项选择题

Jane cannot drive us downtown，for she has（）to take us all.

A.very small a car
B.too small a car
C.so a small car
D.such small a car

单项选择题

Despite scholars’study，the （）of human beings is still unclear.

A.origin
B.cause
C.begin
D.initiate