[课 下 作 业]
Ⅰ.单项填空
1．Some patients experience a slow decline in their health as the effectiveness of the drugs increases ________．
A．by and by B．little by little
C．after all D．all in all
答案 B [by and by不久；little by little逐渐地，缓慢地；after all毕竟；all in all总之。只有B符合句意。]
2．________ by the mudslide，the city was cut off from the outside.
A．Having struck B．To be struck
C．Struck D．Being struck
