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【单选题】
客房销售的首要环节A.
客房预订
B.
客房整理
C.
清洁卫生
D.
礼宾服务
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反馈参考答案：
举一反三
【单选题】The audience ______ when they heard the humorous story.
A.
burst into laughing
B.
burst out laughter
C.
burst into laughter
D.
burst in laughing
【单选题】We were angry when we _____, bu we parted with a smile.
A.
encounter
B.
is encountering
C.
was encountering
D.
encountered
【简答题】酶是一类具有生物（）作用的蛋白质。
【单选题】Which of the following alone can differentiate you from your competitors when handing a business card to customers?
A.
The size of the card.
B.
The right color scheme.
C.
A unique design of the card.
D.
A friendlier logo of your company.
【简答题】酶是一类具有____作用的蛋白质。
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