单项选择题

This main idea of the country

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

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热门试题

单项选择题

From the first paragraph, we know that the author______.

A．used to live in the city
B．works in the city
C．used to work in the country
D．lives in the country

单项选择题

A growing plant needs water for all of the following except ______.

A．forming simple sugars
B．keeping green
C．keeping woody stems
D．producing carbon dioxide