单项选择题

在螺帽或螺栓上进行保险操作时，起点应选在
A、最容易操作的位置
B、最难操作的位置
C、没有特殊的要求

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Questions 5 to 8 are based on the conversation you have just heard.
A、A) She was too young to know cultural differences.
B、B) She didn’t have manners for talking to adults.
C、C) She couldn’t get along well with other children.
D、D) She wanted to play outdoors with her friend.

答案： Old friends.

多项选择题

白细胞渗出的过程为 A. 白细胞边集 B. 白细胞滚动 C. 白细胞黏附 D. 白细胞游出