Thanksgiving is celebrated on _____ in the United States.
A. the first Thursday in November
B. the fourth Thursday in December
C. the first Friday in December
D. the fourth Thursday in November
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People in Canada usually ______.
A. do not celebrate Thanksgiving
B. celebrate Thanksgiving on the same day as the Americans
C. celebrate Thanksgiving earlier than the Americans
D. celebrate Thanksgiving later than the Americans
People in the United Sates celebrate Thanksgiving _____.
A. at home
B. at large restaurants
C. in parks
D. publicly
For Thanksgiving, people in the US can usually stay awayfrom work for _____ days.
A. 1
B. 2
C. 3
D. 4
在机械循环系统中，膨胀水箱接在
A. 供水干管最高处
B. 供水立管的顶端
C. 冷热水设备之前
D. 循环水泵吸入口前
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