行人道路宜选择针入度较大的石油沥青或乳化沥青，沥青混合料的沥青用量宜比行车道用量增加（）%左右。
A、0.1
B、0.2
C、0.3
参考答案：C
Hello! _____ I speak to Mr Smith, please? [ ]
A. Must
B. May
C. Would
D. Need
