额外心音大多出现在
A．S1之前、S2之后
B．S2之前、S1之后
C．S3之前、S2之后
D．S4之前、S3之后
E．S1之前、S4之后
参考答案：A
— ____________ do you feel?
— I feel sick. [ ]
A. What
B. Where
C. How
D. Who
You__________the parcel home. The shop would have delivered it if you had asked.
A．needn’t have carried
B．couldn’t have carried
C．mustn’t have carried
D．shouldn’t have carried
