My family ____ a big family. My family ____ watching TV at home now.
A. is; is
B. is; are
C. are; is
D. are; are
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—Many people think the traffic in Beijing is ____.—I think so, and it is very ____ in cities.
A. busy; quiet
B. heavy; clean
C. clean; noisy
D. heavy; noisy
钢结构耐热不耐火，易锈蚀，耐腐蚀性差
A. 对
B. 错
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