在非感染性发热中，属变态反应性疾病的是
A．血清病
B．中暑
C．大面积烧伤
D．白血病
E．急性心肌梗死
参考答案：D
The monitor theory, which is very popular among foreign language teachers in ______, was put forward by Stephen Krashen in the late 1970s.
A．America
B．Britain
C．China
D．France
流动性差铸件易产生什么缺陷？
