有11个人围成一个圆圈，依次编成1～11号，从1号起轮流表演节目，_爱下问搜题

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问题单项选择题

有11个人围成一个圆圈，依次编成1～11号，从1号起轮流表演节目，轮流的方法是：隔一个人表演一个节目，再隔两个人表演一个节目，再隔一个人表演一个节目，再隔两个人表演一个节目……这样轮流下去，至少要表演多少个节目，才能使每个人表演的次数同样多( )

A．22

B．24

C．25

D．28

答案

参考答案：A

解析：本题考查的是周期问题。表演的人数共11人，且每个人表演次数相同，则至少要表演11N个节目。符合条件的只有A。

补全对话，情景问答

从B栏中找出与A栏相对应的答语。

                                  A
( )1. What are your favourite clothes?
( )2. I like your skirt.
( )3. I like skirts.
( )4. Whose pants are these?
( )5. Is this your hat?
( )6. What' s your favourite colour?
( )7. How many trees can you see in the picture?
( )8. Are they new?
( )9. Do you like English?
( )10. Thank you very much.

                                  B
A. No, it isn't. It's too big.
B. Thanks.
C. We're the same.
D. You're welcome.
E. Yes, I do. Very much.
F. Yes, they're new. They're from my mom.
G. Shirts are my favourite clothes.
H. Red.
I. They are Li Ming's.
J. I can see six.

单项选择题

牙板的发育时间是（）

A.胚胎第2周

B.胚胎第3周

C.胚胎第5周

D.胚胎第6周

E.胚胎第7周