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
When ________ why she could speak English so well, she just smiled and said nothing.
A.asking
B.to be asked
C.was asked
D.asked
个人耐用消费品贷款期限一般在( )年以内,最长为( )年(含)。
A.1,4 B.2,5C.1,3 D.2,4