升空烟花燃放试验场距离居民住宅最小（）m。
A.50
B.30
C.100
D.200
参考答案：C
My brother usually _____ his classroom after school. But now he _____ basketball.
A．cleans; plays
B．is cleaning; plays
C．cleans; is playing
D．is cleaning; is playing
月海
