已知函数
是(-∞,+∞)上的连续函数,则ab=( ).
参考答案:A
解析: [*]由于[*],所以[*],从而利用罗比达法则,[*],即a+[*],选(A).
下列不是地图的“语言”的是( )
A.比例尺
B.颜色
C.方向
D.图例
As soon as his teacher begins lecturing, he begins to doze off, not intentionally but _____.
A.personally
B.randomly
C.habitually
D.unconditionally