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【简答题】
听对话，回答问题。 1. When and where are they talking? A. In the morning at home. B. In the afternoon at workplace. C. In the evening at home. 2. What's the boy doing? A. He is watching the video. B. He is listening to music. C. He is watching TV. 3. Why is Mum very tired in the daytime? A. Because she can't sleep well with the loud music every night. B. Because her son loves music very much. C. Because she goes to bed too late.
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反馈参考答案：
举一反三
【单选题】描述唐氏综合症的患儿核型不正确的为
A.
47,XX, +21
B.
46, XY, + 21
C.
46,XY,,-14,+t（14q21q）
D.
46,XX,,-15,+t（15q21q）
E.
45,XY,,-13,+t（14q21q）
【简答题】如何提高经营利润?
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