单项选择题

The author says that in some hot and dry areas it is advisable to ______.

A．build big lakes to store water
B．construct big pumping stations
C．channel water from nearby rivers to cropland
D．build small and cheap irrigation systems

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单项选择题

According to the passage sport is positive for young people in that ______.

A．it can help them learn more about society
B．it teaches them how to set realistic goals for themselves
C．it enables them to find flaws in themselves
D．it can provide them with valuable experiences

单项选择题

Many coaches and parents are in the habit of criticizing young athletes ______.

A．without realizing criticism may destroy their self-confidence
B．in order to make them remember life's lessons
C．believing that criticism is beneficial for their early development
D．so as to put more pressure on them