The traditional colors of Christmas are ______.
A. black and white
B. green and red
C. white and blue
D. yellow and red
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Many Christmas customs that are popular in the United States and Canada originated in ______.
A. the USA
B. the United Kingdom
Canada
D. Rome
What do people do for Christmas?
A. Schools and colleges close for two weeks.
Business firms are lenient about giving leave to employees for the Christmas visit to their homes.
C. Parents welcome their children and grandchildren homeand often open their doors to friends andstrangers.
D. All of the above.
关于PVC扣板说法错误的是:()。
A. 耐污染、易清洗,有隔音、隔热的良好性能
B. 其耐高温性不好,在较热的环境中工作容易变形
C. 使用寿命相较短
D. 不易老化、变黄
天棚铝扣板常用规格不包含:()。
A. 300mm×300mm
B. 1220×2440mm
C. 300×600mm
D. 300×450mm
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