His mother ______ a new TV set.
A：doesn't have
B：don't have
C：isn't has
D：isn't have
2011年，本·拉登被美国特种部队击毙后，“后本·拉登时代”恐怖主义活动猖獗，各国纷纷采取措施打击恐怖活动。这表明( )
① Are these all ours? ____ A. It is Zhang Peng's.
② Whose is it? ____ B. Yes，it is.
③ Is this yours?____ C. Yes. they are.
50减去25的差乘20加上13，和是多少？正确列式是 （ ）
