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Recent studies show that many young people in the United States never finish high school.Some researchers say about fifteen to twenty percent of public school students do not complete their education.But many other experts and policymakers believe that for the past twenty years,the dropout rate has been around thirty percent.For Latino and black students,the numbers are even higher.Researchers say almost half of them leave schoo1.At the same time,almost half the states let students leave school before the age of eighteen without letting their parents know. Finding a good job without a high school education is _________.A recent study found that almost half of all dropouts aged sixteen to twenty—four did not have a job.The lack of high school education can also lead to other problems.An estimated two—thirds of prisoners in the United States dropped out of high schoo1. The main reason why many students drop out of school is that they are failing.Many are bored with their classes or feel disconnected from their school and teachers.Some students feel that educators place low expectations on them. There have been efforts to increase graduation rates through education reforms during the past twenty years .Some communities are working on dropout prevention programs.These include alternative (其他的) high schools to meet special needs.In addition,experts suggest “early warning systems’’ to help identify young school children at the risk of dropping out of high schoo1.They say schools should also keep regular contact with parents,especially if their children are missing school often. 小题1:What is the best title of the passage? (Please answer within 10 words.) 小题2:Which sentence in the passage can be replaced by the following one? Many students feel tired of their classes or don’t feel connected with their school and teachers. 小题3:Please fill in the blank in Paragraph 2 with proper words or phrases to complete the sentence.(Please answer within 10 words.) 小题4:What do you think is the most important reason for the high dropout rate in the high school?(Please answer within 30 words.) 小题5:Translate the underlined sentence in the last paragraph into Chinese.
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【单选题】普拉西坦是一种改善记忆、抗健忘的中枢神经兴奋药,其结构如右图,下列关于普拉西坦的说法正确的是
A.
它既有酸性,又有碱性
B.
它的二氯取代物有两种
C.
它可以发生水解反应
D.
分子中C、N、O原子均处于同一平面
【单选题】普拉西坦是一种改善记忆、抗健忘的中枢神经兴奋药,其结构如下图,下列关于普拉西坦的说法正确的是 [     ]
A.
它既有酸性,又有碱性
B.
它的二氯取代物有两种
C.
它可以发生水解反应
D.
分子中C、N、O原子均处于同一平面
【多选题】在色谱分析中,对担体的要求是
A.
表面应是化学惰性的
B.
多孔性
C.
热稳定性好
D.
粒度均匀而细小
E.
对样品吸附性强
【单选题】在气相色谱分析中,不属于对固定液的要求是( )。
A.
操作温度下的蒸气压低,热稳定性好
B.
能牢固地粘附在担体惰性表面上
C.
在单体表面具有较好的流动性
D.
对不同的组分有选择能力
【单选题】在气相色谱中,若要求分析强腐蚀的组分,宜选用下列 ( ) 担体
A.
红色担体
B.
氟担体
C.
白色担体
D.
高分子多孔微球担体
【单选题】北伐战争中,有“铁军”称号的是
A.
蒋介石的国民革命军第1军
B.
张灵甫的第74军
C.
叶挺 独立团所在的 国民革命军第4军
D.
李福林的国民革命军第5军
【单选题】北伐战争中,有“铁军”称号的是
A.
蒋介石的国民革命军第 1 军
B.
张灵甫的第 74 军
C.
叶挺的国民革命军第 4 军独立团
D.
李福林的国民革命军第 5 军
【单选题】在气相色谱分析中,不属于对担体的要求是( )。
A.
粒度均匀细小而又多孔
B.
化学惰性、热稳定性好
C.
吸附性强
D.
有一定的机械强度
【单选题】北伐战争中,有“铁军”称号的是
A.
李福林的国民革命军第5军
B.
张灵甫的第74军
C.
蒋介石的国民革命军第1军
D.
叶挺的国民革命军第4军独立团
【单选题】北伐战争中,有“铁军”称号的是
A.
蒋介石的国民革命军第1军
B.
张灵甫的第74军
C.
叶挺任团长的国民革命军第4军独立团
D.
李福林的国民革命军第5军
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