在TBB530中有那几种RRU（）.
A、RRU261
B、RRU268i
C、RRU268
D、RRU168
参考答案：A, B, C
—You don’t look very __________ .Anything wrong ?
—Nothing . I’m just a little tired.
A．good
B．well
C．strong
D．ill
