At the end of the year 2010, some species of birds ddn’t survive the _____ winter in some European countries.
#19243
A
severe
B
serious
C
mild
D
extreme
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This magazine is very___with young people,who like its content and style.
#20393
A
familiar
B
popular
C
similar
D
particular
Never form the habit of smoking because it ______ human beings. 
#19418
A
does harm with
B
is harmful to
C
is harm for
D
does harmful to