单项选择题

It can be inferred from the passage that which of the following presents the greatest danger to diver

A．Pressurized helium.
B．Nitrogen diffusion.
C．Nitrogen bubbles.
D．An air embolism.
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单项选择题
The best title for this passage would be ______.
A．The Importance of Being Visible
B．Role of Women and Minorities in Management
C．Job Performance and Advancement
D．Sex and Career Success
单项选择题
In the last paragraph, play down their visibility refers to ______.
A．show off
B．be very modest
C．not show themselves
D．to debase themselves
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