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问题 选择题
深秋的早晨，我们看到地面、花草上有一层白色的霜，霜的形成是（　　）

A．凝固现象

B．液化现象

C．凝华现象

D．升华现象

答案

答案：C

补全对话，情景问答
从方框中选择合适的选项完成对话。   

Kim: I, Tim,     1    
Tim: It was fantastic, really fantastic.
Kim: Did you go to the zoo?
Tim:     2    1 went to the aquarium. Look, here are my photos.
Kim: Were there any sharks?
Tim: No, there weren't any sharks, but there were some really clever seals.
Kim: Wow,       3             4           
Tim: Well, I hung out with some friends and I bought a souvenir.

A. that sounds wonderful.
B. How was your school trip?
C. No, I didn't. 
D. What else did you do?
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单项选择题 B1型题

细胞膜的跨膜物质转运功能不包括（）

A.单纯扩散

B.易化扩散

C.主动转运

D.被动转运

E.引起兴奋的条件
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