—You must be very excited about going to England for further study.— , but I am afraid I won't do well because my English is poor.
A:I'm sorry
B:Certainly not
C:I don't know yet
D:Well, I ought to be
1956年中共“八大”的召开,是探索建设社会主义道路的良好开端( )
同学之间性格不同,特点各异,每个人都有优点和长处,也有缺点与不足,因此,想与人和睦相处,面对他人的缺点与不足,我们需要( )
函数f(x)=-x2+2x+3的单调递减区间是 ( )