The floor attendant steps forward（）the guests
A. welcoming
B. welcome
C. to welcome
D. to welcoming
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氟利昂制冷剂是否对臭氧层有破坏（）
A. 否
B. 是
目前应用较多的制冷剂按化学成分主要分（）
A. 卤代烃
B. 碳氢化合物
C. 有机物
Which of the following is NOT true about Mei Lanfang？______（）
A. He wrote some plays for Peking opera
B. He created various dances
C. He composed many new melodies
D. He made innovations to the facial makeup, hairstyles and costumes
The features of Gothic architecture could be mirrored in Gothic costume,including______（）
A. high headdresses
B. stiff-bodiced dresses
C. pointed sleeves
D. pointed shoes
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