与胎心律一致的杂音有（）
A.脐带血流音
B.胎儿血流音
C.子宫血流音
D.腹主动脉音
E.胎盘血流音
参考答案：A, B
The question that puzzles them is ___they can finish the work on time.
A．what it is that
B．what is it that
C．how is it that
D．how it is that
（）容器苗时栽植应该轻轻 * * 。
A、藤木
B、乔木
C、灌木
D、草本花卉
