There are ________ approaches to English teaching. But not all of them are equally efficient for our Chinese students.
A:variety
B:accurate
C:original
D:diverse
网络流行语:人生就是茶几,上面摆满了杯具(悲剧)洗具(喜剧)。人生的茶几上摆满了杯具(悲剧),这主要启示我们( )
如图,抛物线y=ax2+1与双曲线y=mx的交点A的横坐标是2,则关于x的不等式mx+ax2+1<0的解集是____.
眼睛对我们每个人来说是非常重要,看书写字眼睛离书保持____厘米,且时间不超过____分钟。