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回答（62）题查看材料

A. speak
B. discuss
C. talk
D. debate

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回答（60）题查看材料

A. common
B. different
C. positive
D. negative

回答（61）题查看材料

A. widely
B. heavily
C. seriously
D. broadly

Our duty is to ensure your security in public.

A. cleaness
B. secret
C. distance
D. safety

回答（59）题查看材料

A. rules
B. procedures
C. regulations
D. steps