单项选择题

They were _______ in their scientific research, not knowing what happened just outside their lab.

A．submerged
B．immersed
C．dipped
D．drowned
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单项选择题
As one of the youngest professors in the university, Miss King is certainly on the _______ of a brilliant career.
A．threshold
B．edge
C．porch
D．course
单项选择题
To help students understand how we see, teachers often draw an _______ between an eye and a camera.
A．axis
B．image
C．imitation
D．analogy
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