公安机关的人民警察按照职责分工，依法履行监督管理计算机信息系统的安全保护工作。()
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【B14】
A. down
B. round
C. out
D. back
Which of the following characteristics of the sea cucumber seems to fascinate the author most？
A. What the sea cucumber does when threatened.
B. Where the sea cucumber lives.
C. How the sea cucumber hides from predators.
D. What the sea cucumber eats.
A．Mary's watch was slow.B．Mary's watch was fast.C．Mary was punctual.D．Mary was never l
A. Mary's watch was slow.
B. Mary's watch was fast.
C. Mary was punctual.
D. Mary was never late.
A．Artists.B．Tour guidesC．Grocers.D．Musicians.
Artists.
B. Tour guides
C. Grocers.
D. Musicians.
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