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【单选题】
人体内的气体交换是通过（ ）A.
呼吸作用实现的
B.
呼吸运动实验的
C.
气体扩散作用实现的
D.
呼吸肌的收缩、舒张实现的
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反馈参考答案：
举一反三
【单选题】【3+2天天练 第13天】下列哪一个选项是空缺处的最佳答案。It has sailed across the Atlantic many times. It has sailed across the Atlantic ______ .
A.
sometimes
B.
always
C.
often
D.
usually
【单选题】—I didn’t ask for the name list .why on my desk? —I put it there just now in case you needed it.
A.
does it land
B.
has it landed
C.
will it land
D.
had it landed
【简答题】i rabbit.mp4 Why does the man in white shirt decide to throw the Irabbit away? What made him change his mind?
【单选题】why doe the woman want to let her apartment go?
A.
She doesn’t have time to move.
B.
She would have difficulty finding another apartment.
C.
She’s paid her rent for the summer in advance.
D.
She doesn’t want to paint another apartment.
【单选题】—Why not find a new job? —Why should I? I _____________ as much，but I like what I'm doing．
A.
didn't earn
B.
don't earn
C.
hadn't earned
D.
haven’t earned
【简答题】Dear Reader， Today I'm going to ask you to support Wikipedia with a donation. Sounds unusual: Why does one of the world's five most popular websites ask for financial support from its users? Wikipedia...
【简答题】i rabbit.mp4 Why does the man in white shirts decide to throw the iRabbit away? What makes him change his mind? (请上传音频回答问题)
【单选题】Why doesn' t the woman accept the chocolate?
A.
Because of her stomachache.
B.
Because she doesn' t like it.
C.
Because of her teeth problem.
D.
Because she never eats chocolate before.
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