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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单项选择题
According to the passage, ______ appeared earlier than ______.
A．apples; oranges
B．oranges; apples
C．oranges; roses
D．algae; wheat
单项选择题
What does the word malfunction mean in paragraph 1
A．失误
B．制造
C．影响
D．事情
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