单项选择题

This passage focus on （）.

A．new ways to grow spinach
B．the population explosion
C．research to produce more food
D．desert farming

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单项选择题
Two things are the same size but differently weight. That means（）.

A．the heavier one has lower density
B．the lighter one has greater density
C．they have the same density
D．they have different density
单项选择题
It's not an easy task. However, please have him ______ it.
A．do
B．to do
C．done
D．doing
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