下列运算错误的是（ ） A．2a3+3a2=5a5 B．（a2）3=a6 C．a2•a

Many researchers have found greater dependence and obedience in very young girls, greater autonomy and activity in boys. When a barrier is set up to separate children from their mothers, boys try to knock it down; girls cry helplessly. There is little doubt that mother’s encouragement or discouragement—of such behavior plays a major role in determining adult personality. For example, a mother often stimulates male autonomy by throwing a toy far away from her young son, thus silently suggesting to him that he leaves her to get it.
Animal studies suggest that there may be a biological factor in material behavior; mothers of some monkeys punish their male babies earlier and more often than their female offspring; they also touch their female babies more often and act more protectively toward them.
As for the controversial question of female "passivity", psychologist Helen Deutsh believes that the concept has been misunderstood. "There is no contradiction between being feminine and working. The self can be active in both men and women," she says. It is only in love and sex that passivity is particularly appropriate for women. As she sees it, passivity is no more than a king of openness and warmth; it does not mean "inactivity of emptiness".
Another controversy ranges over the effect of hormones. Aggressive women; who discount hormonal influence, disagree violently with scientific researchers, who almost unanimously agree that hormones help determine how people feel and act. So far, there have been few studies of male hormones, but scientists think they may eventually discover hormonal cycles in men that produce cyclic changes in mood and behavior. As for females, studies have indicated that 49 percent of female medical and surgical admissions, most psychiatric hospital admission and 62 percent of violent crimes among women prisoners are related with hormonal cycles in women.

What is the best title for this passage

A．Hormone Effect


B．Male and Female
C．Passivity and Activity

D．Female Passivity

不是出口打火机报检时应提供的单据有( )

A．《出口打火机、点火枪类商品生产企业自我声明》

B．《出口打火机、点火枪类商品生产企业登记证》

C．出口打火机、点火枪类商品的质量许可证

D．出口打火机、点火枪类商品型式试验报告

下列行为属于侵犯公民姓名权的是  ( )

A．小刘常给同学起外号，以此取乐

B．小王以小李的名义发短信让他家人寄钱

C．小宋偷看别人的日记，将笔记中的内容向班上同学传播

D．刘田私拆同学的信件，并将邮票占为已有

对于公差的数值，下列说法正确的是：()

A．必须为正值

B．必须大于零或等于零

C．必须为负值

D．可以为正、为负、为零

函数INT(LEN("123.456"))的结果是 【6】 。