主要呈机械刺激作用的粉尘，随溶解度的增加其危害作用( )。
A．增加B．减弱C．不变D．有时增加，有时减少
参考答案：B
比较有影响的气质类型学说有（）。
A.血型说
B.体型说
C.体液说
D.激素说
Tom said he ( )with us if he ( )free the next day.
A．will go, is
B．went, were
C．would go, was
D．will go, was
