单项选择题

Ph. D. students who haven't completed their dissertations by the time their fellowships expire face a dif ficult

A．corner
B．dilemma
C．perplexity
D．bewilderment
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单项选择题
It is said that the newly appointed president is ______ of an artist.
A．anyone
B．somebody
C．something
D．anybody
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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