一种元素的离子变成原子,这种离子发生的变化是[ ]
A.一定失去电子
B.可能失去电子,也可能得到电子
C.一定得到电子
D.既不失去电子,也不得到电子
答案:B
She wasn't _____ with the knife.She cut herself.[ ]
A.careful enough
B.enough careful
C.carefully enough
D.enough carefully
扬长避短,是自强的捷径。[ ]