目前，货运电子交易方式在我国还处于______。
A．成熟阶段 B．成长阶段 C．初级阶段 D．高级阶段
参考答案：C
已知函数f(x)＝4sin2(x＋)＋4sin2x－(1＋2)，x∈R.
(1)求函数f(x)的最小正周期和图象的对称中心；
(2)求函数f(x)在区间上的值域．
Judging from his __ look, I can say Mr. Li is ___ at our arrival at this time.
A．annoying, annoyed
B．annoying, annoying
C．annoyed, annoyed
D．annoyed, annoying
