从投资经济性考虑，电池的使用寿命必须与通信设备的更新周期相匹配，即（）年左右。
A.1
B.5
C.10
D.20
参考答案：C
下列字形全都正确的一项是[ ]
A、寒喧 惘然若失 娇生惯养 纨绔子弟
B、毕竟 口蜜腹箭 瞠目结舌 运筹帷幄
C、诡秘 沧海桑田 放诞无礼 枫叶凋敝
D、烟霭 锐不可挡 作客他乡 流血漂橹
_______, she is the sort of woman to spread sunshine to people through her smile
A．Shy and cautious
B．Sensitive and thoughtful
C．Honest and confident .
D．Lighthearted and optimistic
