履行法律义务就是履行道德义务，履行道德义务也是履行法律义务。[ ]
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中温带的作物熟制是[ ]
A．一年一熟
B．一年两熟
C．一年三熟
D．两年三熟
There _______ a pen and some pencils on the desk. [ ]
A. are
B. is
C. have
D. has
