单项选择题

The main idea of the first paragraph is ______.

A．life on land probably began about 430 years ago
B．the first animal on land came from oceans
C．there wouldn't be animals without plants
D．plants are the only form of life that is able to get and store energy

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单项选择题

Which of the following is tree

A．Algae has 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 land.

单项选择题

The purpose in writing this text is ______.

A．to encourage people to recycle their rubbish
B．to introduce a recycling system for high rises
C．to describe the use of computer technology in recycling
D．to explain the need for rubbish collection in high rises