单项选择题

About what percent of the gifted has not graduated from colleges

A．30%
B．70%
C．80%
D．21%
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单项选择题
The first trees were like modern trees in most ways except that ______.
A．they do not have branches
B．they do not have flowers
C．they do not have seeds
D．they do not need sunlight
单项选择题
Plants with roots appeared about ______ million years ago.
A．430
B．300
C．330
D．100
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