甲、乙两人进行射击训练，在相同条件下各射靶5次，成绩统计如下：
命中环数/环
7
8
9
10
甲命中的频数/次
2
0
1
乙命中的频数/次
3
A. Ann wants to be a nurse. She wants to look after sick people (照顾病人).
B. Mrs Green is a taxi driver. She likes driving. She is good at driving.
C. Jerry wants to be a fireman. He is not afraid of fire. He wants to fight fires.
D. This is Jim. He wants to be a policeman (警察).He wants to help people.
____
如果双眼皮是显性性状，用A控制，单眼皮是隐性性状，用a控制，一对夫妇均为双眼皮，生单眼皮男孩的可能性是（）
读世界某区域简图，回答下列各题。
