―I’ll be away on a business trip. Would you mind looking after my cat?   

―Not at all. ___________. 

A．I have no time

B．I’d rather not

C．I’d like it

D．I’d be happy to

关于一过性胎心率变化的描述正确的是（）

A.是指与胎动有关的胎心率的变化

B.分为早期减速，变异减速，晚期减速

C.变异减速胎心率减慢与宫缩无恒定关系

D.加速为宫缩时胎头受压所致

E.早期减速是脐带受压兴奋迷走神经所致