单项选择题

He noticed the helicopter hovering over the field. Then to his astonishment, he saw a rope ladder ______ out and three men climbing down it.

A．throwing
B．being thrown
C．having throw
D．having been thrown
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单项选择题
It's hard to confirm or refute that there's a causal relationship between the amount of fat we eat and the ______ of heart attacks.
A．incidence
B．impetus
C．momentum
D．emergence
单项选择题
Variables such as individual and corporate behavior ______ nearly impossible for economists to forecast economic trends with precision.
A．make
B．make it
C．making
D．makes it
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