胎儿血液含氧量最低的血管是()
A.静脉导管
B.脐动脉
C.下腔静脉
D.肺静脉
E.主动脉
参考答案:B
The West Lake is famous for its beautiful scenery.
A.is bad for
B.is useful for
C.is good for
D.is well-known for
福祉临到()的头;强暴蒙蔽()的口。