()是由乌尔福克和伦奇提出来的语言学习理论。
参考答案:四范畴说
I have been convinced that the print media are usually more ____ and more reliable than television.
A.shallow
B.ridiculous
C.urgent
D.accurate
下列变化属于化学变化的是()。
A、汽油挥发
B、气化液化
C、白磷自燃
D、灯丝发光