单项选择题

A dam is usually built ______.

A．to cover the houses and fields
B．for people to have the right amount of water at all times
C．to help crops grow better
D．to form a large lake
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单项选择题
The main purpose of announcing the above events is to give information about ______.
A．visiting teams
B．famous players
C．things to do for the weekend
D．prices to pay for the sports events
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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