He stayed in Kaifeng 5 years _____.[ ]
A. before
B. ago
C. in front of
D. in front
答案:B
—Where is Jenny?
—She ______ TV at home.
A.watch
B.watches
C.watching
D.is watching
对管路和阀件的外表面进行清洁及补漆、修理()是锅炉管路阀件的保养内容之一。
A、管线
B、保温层
C、阀门
D、缺陷