设X=ab，Y=cd分别为2位二进制正整数，X＞Y的逻辑表达式是( )。

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.

Which of the following is NOT true of the study of hormones

A．There are disputes to the effect of hormones.
B．Most women know that hormones have much to do with people’s behavior.
C．Nearly all researchers believe that hormones directly link to people’s action and feeling.
D．Aggressive women don’t believe the effect of hormones so much as researchers do.

施工合同示范文本规定，承包商递交索赔报告28天后，工程师未对此索赔要求作出任何表示，则应视为( )。

A．工程师已拒绝索赔要求
B．承包人需提交现场记录和补充证据资料
C．承包人的索赔要求已成立
D．需等待发包人批准

按照大气质量指数评价大气环境质量，可以分为五级，其中Ⅱ级为（）

A.重度污染

B.中度污染

C.轻度污染

D.尚清洁

E.清洁

钩藤在煎煮时宜（）

A.先煎

B.后下

C.包煎

D.烊化

E.另煎

根据临床表现难以区分肠结核与克罗恩病时，最可靠的鉴别方法是

A．多次粪便结核杆菌培养
B．全消化道钡餐检查
C．肠镜检查
D．诊断性抗痨治疗
E．剖腹探查