填空题

S3

【参考答案】

act→ action

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S1

单项选择题

A．It is a self-sufficient community.B．It offers cheap land to people.C．It tends to concentrate on a single product.D．It lies within a space station orbiting Earth.

A．It is a self-sufficient community.
B．It offers cheap land to people.
C．It tends to concentrate on a single product.
D．It lies within a space station orbiting Earth.

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