城市消防指挥中心火警受理台能接收公用电话网的119火灾报警信号。（）
参考答案：对
创伤应激时机体的蛋白质增加（）。
A.分解
B.合成
C.消化
D.吸收
E.氧化
.
Many companies give away small quantities of their produce as samples ____ people can try them before buying them.
A．if
B．because
C．so that
D．since
