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问题 补全对话，情景问答
补全对话。
A:    1    .
B: Hello, I'm Jack Brown.          
A: Nice to meet you.              
B:    2    .                    
A: Is this your friend?              
B: Yes.
A: What's his name?
B:    3     .
A: Hi!
C: Hi! Here's my name card.
A:   4     .
A. Nice to meet you.
B. Hello, what's your name?
C. Thanks.
D. His name is Tom Green
答案

1-5 BADC

选择题

The time _________ I first spend with Nelson Mandela was a very difficult period of my life.

A． when

B． which

C． of which

D． at which
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单项选择题

图13-3所示单元体剪应变γ应该表示为（）。

A.γxy

B.γyx

C.γzx

D.γyz
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