新生儿持续性肺动脉高压的病因描述，正确的是（）
A.早产或低出生体重
B.肺血管发育不良
C.新生儿贫血
D.存在先天性心脏病
E.气胸
参考答案：B
The Boston Marathon bombings killed 3 people, including a Chinese citizen ________ Shenyang.
A．in
B．from
C．across
D．to
- - -where will you live?
- - -I will live______ a space station.
A. at B. on C. in
