调频波的产生有两种方式。()。
A.直接
B.间接
C.合成
D.广播
参考答案:A, B
Because the driver was not ________ the new limit, he was stopped and warned for speeding.[ ]
A. good at
B. tired of
C. aware of
D. interested in
Which is the_____, the train station, the bus station or the airport? [ ]
A. far
B. farthest
C. farther
D. more far