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
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单项选择题
He is my best friend and ______ all my sufferings.
A．shares
B．participates
C．partakes
D．contributes
单项选择题
______ any film before, his first attempt was a great success.
A．Though having never directed
B．Despite he had never directed
C．As he had never directed
D．In spite of his never having directed
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