治血热吐血，衄血宜选
A．石膏B．知母C．天花粉D．栀子E．夏枯草
参考答案：D
一个数的相反数小于它本身，这个数为[ ]
A．负数
B．正数
C．非负数
D．非正数
About ___of the workers in the factory were born_____.
A．two thirds,in the 1970
B．two thirds,in the 1970s
C．two third,in the 1970
D．second thirds,in the 1970s
