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【单选题】
小儿心脏发育的特点是A.
7岁时心脏容积已达成人水平
B.
新生儿和小于2岁的幼儿心脏呈斜位
C.
左、右心室的增长不平衡
D.
10岁以前主动脉的直径较肺动脉宽
E.
心率相对较慢，是因心搏出量比成人小
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【简答题】I didn’t see your sister at the meeting. If she _____, she would have met my brother. A. has come B. did come C. came D. had come
【单选题】I didn't see your sister at the meeting. If she ______, she would have met my father. [ ]
A.
has come
B.
did come
C.
come
D.
had come
【单选题】I didn’t see your sister at the meeting. If she __________, she would have met my brother.
A.
has come
B.
did come
C.
come
D.
had come
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