定义在区间[0，3π]上的函数y=sin2x的图象与y=cosx的图象的交点个数是（）.
参考答案：7
Mr．Smith was very glad _____ as the manager of the company．
A．being appointed
B．having appointed
C．to have appointed
D．to have been appointed
4位老师带三（1）班34名同学去郊游，每顶帐篷只能住5人，需要搭多少顶帐篷？
