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

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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

单项选择题

The third paragraph suggests that ______.

A．modern dams are all made of concrete
B．Romans once built many great dams
C．there was too much water in Iraq in the past
D．modern dams are better than early dams