—___these her erasers?
—No, they ___.
A:Is, isn't
B:Are, aren't
C:Are, is
D:Is, are
关注家园幅员辽阔的祖国自然环境复杂多样,人文现象千姿百态.据此完成小题.被誉为“东方甜岛”的是( )
先化简,再求值:(x+5)(x﹣1)+(x﹣2)2,其中x=﹣2.
如图所示为闭合电路中两个不同电源的U﹣I图象,则下列说法中正确的是( )