对于符合我国《专利法》规定的专利申请，由哪个部门颁发专利证书？（）
A、专利复审委员会
B、国务院专利行政部门
C、专利事务所
参考答案：B
We often go to park ______ Sunday afternoon. [ ]
A. in
B. to
C. at
D. on
At times the balance in nature is ______ , resulting in a number of possibly unforeseen effects.
A．troubled
B．confused
C．disturbed
D．puzzled
