单项选择题

This passage is mainly about ______.

A．the functions of carbon dioxide and water
B．the role of water in a growing plant
C．the process of simple sugar formation
D．the synthesis of water with carbon dioxide

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单项选择题

How long did he live

A．To the age of 90.
B．To the age of 80.
C．To the age of 70.
D．To the age of 60.

单项选择题

Becoming a doctor is ______ idea.

A．Tom’s
B．Steve’s
C．Steve’s father’s
D．Tom’s father’s