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【简答题】
“It hurts me more than you”, and “This is for your own good”—these are the statements my mother used to make years ago when I had to learn Latin, clean my room, stay home and do homework. That was before we entered the permissive period in education in which we decided it was all right not to push our children to achieve their best in school. The schools and the educators made it easy for us. They taught that it was all right to be parents who take a let-alone policy. We stopped making our children do homework. We gave them calculators, turned on the television, left the teaching to the teachers and went on vacation. Now teachers, faced with children who have been developing at their own pace for the past 15 years, are realizing we’ve made a terrible mistake. One such teacher is Sharon Klompus who says of her students—“so passive”—and wonders what has happened. Nothing is demanded of them, she believes. Television, says Klompus, contributes to children’ s passivity. “We’ re talking about a generation of kids who’ ve never been hurt or hungry. They have learned somebody will always do it for them, instead of saying ‘go and look it up’, you tell them the answer. It takes greater energy to say no to a kid.” Yes, it does. It takes energy and it takes work. It’ s time for parents to end their vacation and come back to work. It’ s time to take the car away, to turn the TV off, to tell them it hurts you more than them but it’ s for their own good. It’s s time to start telling them no again.
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【单选题】两相分离器具有将油井产物分离为 两项的功能。
A.
气、液
B.
气、砂
C.
液、砂
D.
气、水
【简答题】蛋白质和核酸对紫外线均有吸收。蛋白质的吸收峰波长靠近( ) nm ;核酸的吸收峰波长靠近( ) nm
【单选题】下列能与水互溶的溶剂为
A.
正丁醇
B.
石油醚
C.
甲醇(乙醇)
D.
E.
丙酮
【简答题】第一次产业革命的标志是();第二次产业革命的标志是();第三次产业革命的标志是()的利用,()为主要标志的()的出现,第四次产业革命的标志是()的广泛应用。
【单选题】互为同分异构体的物质是
A.
甲醛和甲酸甲酯
B.
乙酸和丙醇
C.
1-戊烯和2-庚烯
D.
乙醛和丙酮
E.
邻-甲基苯酚和苯甲醚
【单选题】能与水完全互溶的溶剂是
A.
正丁醇
B.
石油醚
C.
三氯甲烷
D.
丙酮
E.
乙酸乙酯
【单选题】下列物质中,最简式相同且互为同系物的是
A.
甲醛和甲酸甲酯
B.
乙酸和丙醇
C.
乙醛和丙酮
D.
1-戊烯和2-庚烯
E.
邻-甲苯酚和苯甲醚
【单选题】下列各组物质中不互为同分异构体的是
A.
葡萄糖和果糖
B.
乙酸和甲酸甲酯
C.
丙醛和丙酮
D.
乙醇和乙醚
【单选题】下列物质中,互为同分异构体的是
A.
乙醛和甲酸甲酯
B.
乙酸和丙醇
C.
乙酸甲酯和丙酮
D.
1-戊烯和2-庚烯
E.
邻-甲苯酚和苯甲醚
【单选题】N A 为阿伏加德罗常数,下列说法正确的是(   )
A.
标准状况下,11.2L的己烷所含的分子数为0.5N A
B.
乙醇和乙醚互为同分异构体
C.
1 mol甲基(—CH 3 )所含的电子总数为10 N A
D.
现有乙烯、丙烯、丁烯的混合气体共14g,其原子数为3N A
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