单项选择题

When you do scuba diving, you can ______.

A．stay in deep water for a long time
B．dive very, very deep
C．live in deep water easily
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单项选择题
In the daytime, when you dive in the sea, you ______.
A．can see everything green and blue
B．can't be in danger
C．can catch nothing
单项选择题
How many dangers will animals meet in the deep sea
A．Two.
B．Three.
C．Four.
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