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
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单项选择题
Plants with roots appeared about ______ million years ago.
A．430
B．300
C．330
D．100
单项选择题
Which of the following is true
A．Algae have existed for more than 430 million years.
B．It is impossible that algae might be the earliest plant on land.
C．Plants get food from animals in the oceans.
D．Evolution began after animals appeared on lan
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