单项选择题

To avoid the mistakes of our forefathers, the author suggests that ______.

A．we plant more trees
B．we return to nature
C．natural sciences be taught to everybody
D．environmental education be directed toward everyone
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单项选择题
What does the author imply by saying living space.., is figured ... also in cubic volume above the earth ( Lines 7- 8, Para. 3)
A．Our living space on the earth is getting smaller and smaller.
B．Our living space should be measured in cubic volume.
C．We need to take some measures to protect space.
D．We must preserve good living conditions for both birds and animals.
单项选择题
In what sense was Niagara Falls thought to embody religious qualities
A．Niagara Falls was discovered by clergymen.
B．It was regarded as signal instance of the hand of the Creator.
C．People gave Niagara Falls a fearful aspect and hence a holy meaning.
D．Some people claimed to have sensed God's presence in the cataract's rushing water.
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