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The worsening of global warming, _____human activities are to blame, has led to frequently extreme weather.
#78724
A
by which
B
for which
C
that
D
what
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Now everyone is concerned about how to conquer the economic crisis, __________is very important for us to preserve our standard of living．
#78697
A
which success
B
its success
C
the success of which
D
the success of it
I have many foreign friends,         some are businessmen.
#78718
A
of them
B
from which
C
who of
D
of whom
 Mary was much kinder to Jack than she was to the others，______， of course, made all the others upset.(2011·北京)
#78611
A
who
B
which
C
what
D
that
        is recorded in the history book , Diaoyu Island has belonged to China since ancient times.
#78639
A
As
B
That
C
Which
D
What
He was very rude to the customs officer, ____ of course made things even worse.
#78719
A
who　
B
whom　
C
what　　
D
which