1988年3月，我国首例（）在北京医科大学第三医院成功进行了接生手术。
A、代孕婴儿
B、试管婴儿
C、双胞胎婴儿
参考答案：B
I think swimming is _____ hiking.[ ]
A. as interesting than
B. as more interesting as
C. as interesting as
D. more interesting as
汇票是出票人委托他人付款的委付证券，出票人的出票行为意味着付款人因此承担付款义务。( )
