—Who are they?
—______ are Maria and Jane.[ ]
A. He
B. They
C. She
答案：B
The patients are quite_______ to the nurses for their special care. [ ]
A. enjoyable
B. helpful
C. confident
D. grateful
磁粉探伤对工件磁化的方法可分成（）。
A、通电磁化法
B、通磁磁化法
C、触头磁化法
D、上述都对
