Shanghai lies _____ the east of China.[ ]
A. to
B. in
C. on
D. at
答案：B
David’s parents divorced when he was six，which deeply________him for a few years.[ ]
A．banned
B．developed
C．affected
D．produced
输气管道堵塞的原因是由于天然气在运行中携带的（）在低洼处形成堆积堵塞..
A.固体杂质和水
B.液体杂质和石块
C.气体杂质和液体杂质
D.固体和液体杂质
