焦炭按块度，一般分（）个等级。
A.2
B.3
C.4
D.5
参考答案：C
—What's Tom going to do next Sunday?
— I'm not sure. He _____ go to the country to see his uncle. [ ]
A. can
B. must
C. will
D. may
145，( )，111，94，77，60
A．130 B．128 C．126 D．124
