单项选择题

A．source
B．origin
C．course
D．finance
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单项选择题
How much of the earth’s water can man really use
A．He can use nearly 75% of it.
B．He can use about 97% of it.
C．He can use exactly 3% of it.
D．He can use less than 3% of it.
单项选择题
What the speaker says is the common misconception about crocodile mothers
A．That they leave the water.
B．That they dig a hole in the sand.
C．That they open their nests.
D．That they eat their babies.
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