填空题

It is easy for boats to tumble over in the Colorado River because ______.

【参考答案】

the river is full of unpredictable twists and turns
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单项选择题
A．You hear the gun before you see the smoke.B．You see the smoke before you hear the gun.C．The sound of the gun will reach you before the race starts.D．Racers start to run before you see the smoke.
A．You hear the gun before you see the smoke.
B．You see the smoke before you hear the gun.
C．The sound of the gun will reach you before the race starts.
D．Racers start to run before you see the smoke.
填空题
What comment did the author make about the highly successful people traveling with him
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