根据各组对话内容，从下面方框中提供的5个选项中选出能填入空白处的最佳选项，并将字母代号填写在答题卡上相应的位置．

A: I’m going shopping.B: Do you mind if I come with youA: (). You can carry my bag for me.

单项选择题该处选项为（）。

A．This tour is the chance of lifetime．
B．It goes all over North America and South America．
C．It looks like you’re dreaming about something．
D．You’ll have to quit school and your job at the store．
E．My agent wants me to go on a tour with Art’s Jazz Band．
F．Have you told anyone about this yet
G．It would be a great opportunity!

单项选择题A: Thank you for looking after the cat for me.B.().I love cats.

A. Thank you
B. It’s my pleasure
C. By the way
D. No, of course not
E. Never mind

单项选择题正三棱锥A—BCD的体积为（ ）．

单项选择题A．<br ><img src= {$uploaddir} ea1b4302-f3df-4a9c-8d3b-6cf2ac87f52e.jpg >B．<br ><img src= {$uploaddir} 601c8ddf-c709-438a-b1ed-de2421d118c7.jpg >C．8D．12

单项选择题已知集合A={x|5x-a≤0}，B={x|6x-b＞0}，a∈N，b∈N(其中N为自然数集)，且满足(A∩B.∩N={2，3，4}，则整数对(a，b)的个数为（ ）．