89. Every child is _____ to it parents.
A.precious
B.possible
C.expensive
D.Valuable
答案:A
______ first used the term "communicative competence" in deliberate contrast to Chomsky's "linguistic competence".
A. Stern B. AsherC. Krashen D. Hymes
下列四项设备中,属于输入设备的是()。
A.显示器
B.打印机
C.鼠标器
D.绘图仪