The examples given for the first kind are________．
A．whistles and sirens
B．doorbells and telephone bells
C．church bells and telephone bells
D．typewriters and cash registers
正确答案：B
参见第二段第一句
Theexamplesgivenforthefirstkindare________．A．whistles
本文来自网络，不代表煤炭资讯立场。转载请注明出处： http://www.mtxh.cn/zh/401564.html
