I’ve listened to Professor Smith’s talk about medicine,but I still haven’t got a good understanding of its key _________.
#7016
A
notes
B
information
C
words
D
points
推荐题目
Have you made out your ______ for a passport?
#7059
A
appointment
B
application
C
apposition
D
appreciation
 They were trying to remove harmful ______ from cigarettes.
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A
content
B
substances
C
materials
D
mixtures