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Text 1 Homework has never been terribly popular with students and even many parents, but in recent years it has been particularly scorned. School districts across the country, most recently Los Angeles Unified, are revising their thinking on his educational ritual. Unfortunately, L.A. Unified has produced an inflexible policy which mandates that with the exception of some advanced courses,homework may no longer count for more than 10% of a student’s academic grade. This rule is meant to address the difficulty that students from impoverished or chaotic homes might have in completing their homework. But the policy is unclear and contradictory. Certainly, no homework should be assigned that students cannot do without expensive equipment. But if the district is essentially giving a pass to students who do not do their homework because of complicated family lives, it is going riskily close to the implication that standards need to be lowered for poor children. District administrators say that homework will still be a pat of schooling: teachers areallowed to assign as much of it as they want. But with homework counting for nomore than 10% of their grades, students can easily skip half their homework andsee vey little difference on their report cards. Some students might do well onstate tests without completing their homework, but what about the students whoperformed well on the tests and did their homework? It is quite possible that the homework helped. Yet rather than empowering teachers to find what worksbest for their students, the policy imposes a flat, across-the-board rule. At the same time, the policy addresses none of the truly thorny questions abouthomework. If the district finds homework to be unimportant to its students’academic achievement, it should move to reduce or eliminate the assignments,not make them count for almost nothing. Conversely, if homework does nothing toensure that the homework students are not assigning more than they are willingto review and correct. The homework rules should be put on hold while the school board, which is responsiblefor setting educational policy, looks into the matter and conducts publichearings. It is not too late for L.A. Unified to do homework right. 21.It is implied in paragraph 1 that nowadays homework_____. [A]is receiving more criticism [B]is no longer an educational ritual [C]is not required for advanced courses [D]is gaining more preferences 22.L.A.Unified has made the rule about homework mainly because poor students_____. [A]tend to have moderate expectations for their education [B]have asked for a different educational standard [C]may have problems finishing their homework [D]have voiced their complaints about homework 23.According to Paragraph 3,one problem with the policy is that it may____. [A]discourage students from doing homework [B]resultin students' indifference to their report cards [C]undermine the authority of state tests [D]restrict teachers' power in education 24.As mentioned in Paragraph 4, a key question unanswered about homework is whether______. [A] it should be eliminated [B]it counts much in schooling [C]it places extra burdens on teachers [D]it is important for grades 25.A suitable title for this text could be______. [A]Wrong Interpretation of an Educational Policy [B]A Welcomed Policy for Poor Students [C]Thorny Questions about Homework [D]A Faulty Approach to Homework
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A.
反映监督
B.
协调制约
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财力保证
D.
人员控制
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A.
凡是中心原子采取sp 3 杂化轨道成键的分子,其空间构型都是正四面体形
B.
BeCl 2 分子中的sp杂化轨道是由Be原子的s轨道和Cl原子的p轨道混合起来形成的
C.
sp 3 杂化轨道是由同一个原子中能量相近的s轨道和p轨道混合起来形成的一组能量相近的新轨道
D.
凡是AB 3 型分子,其中心原子A均采取sp 3 杂化轨道成键
【单选题】关于原子轨道的说法正确的是
A.
凡是中心原子采取sp 3 杂化轨道成键的分子其立体构型都是正四面体形
B.
CH 4 分子中sp 3 杂化轨道是4个H原子的1s轨道和C原子的2p轨道混合起来而形成的
C.
sp 3 杂化轨道是由同一个原子中能量相近的s轨道和p轨道混合形成的一组能量相近的新轨道
D.
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A.
凡是中心原子采取sp 3 杂化成键的分子其几何构型都是正四面体
B.
CH 4 分子中的sp 3 杂化轨道是由4个H原子的1s轨道和C原子的2p轨道混合起来而形成的
C.
sp 3 杂化轨道是由同一个原子中能量相近的s轨道和p 轨道混合起来形成的一组能量相近的新轨道
D.
凡AB 3 型的共价化合物,其中心原子A均采取sp 3 杂化
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A.
电子的跃迁
B.
价电子的跃迁
C.
键的断裂
D.
键的振动
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A.
凡是中心原子采取sp 3 杂化轨道成键的分子其几何构型都是正四面体
B.
CH 4 分子中的sp 3 杂化轨道是由4个H原子的1s轨道和C原子的2p轨道混合形成
C.
sp 3 杂化轨道是由同一个原子中能量相近的s 轨道和p轨道混合起来形成的一组新轨道
D.
凡AB 3 型的共价化合物,其中中心原子A均采用sp 3 杂化轨道成键
【单选题】红外光谱中的吸收带是由于 产生的
A.
键的断裂
B.
电子的跃迁
C.
价 电子的跃迁
D.
键的振动
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【单选题】红外光谱中的吸收带是由于 产生的。
A.
键的振动
B.
键的断裂
C.
电子的跃迁
D.
价 电子的跃迁
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