单项选择题

The first paragraph mainly talks about ______.

A．the problems caused by river water
B．the necessity to irrigate the field
C．the water shortage in some countries
D．the canals carrying water to fields

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单项选择题

The underlined word that (Line 4, Para. 2 ) means ______.

A．a dam will be built across the river
B．a dam will store water for dry seasons
C．in wet seasons a dam will prevent the flooding of the land
D．houses and fields will be covered with water

单项选择题

What do people tend to believe other's life is when they are in a big city

A．The other's life is lonely.
B．The other's life is happy.
C．The other's life is exciting.
D．The other's life is full, rich and busy.