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

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热门试题

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 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