(2013·高考浙江卷)Bears ________ fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.
#11940
A
pack up
B
build up
C
bring up
D
take up
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As far as I know, this maths problem is _______________ that one.
#14428
A
twice so difficult as
B
twice as difficult as
C
as twice difficult as
D
so twice difficult as