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【简答题】
学习了金属的化学性质后，某兴趣小组进行了如下实验：将足量镁条加入到氯化铜溶液 中，观察到镁条表面有气泡产生，同时有红色固体附在镁条表面。 【提出问题】产生气体是什么物质? 有红色固体又是什么物质？ 【查阅资料】在金属活动性顺序里，位于氢后面的金属Cu，在常温下虽然不能与稀盐酸、稀硫酸反应，但可以与稀硝酸反应，其化学方程式为： 3Cu+8HNO 3 (稀)＝3Cu(NO 3 ) 2 +2NO ↑ +4H 2 O 反应生成的NO是无色、难溶于水的气体，在常温下与空气中的O 2 迅速化合生成  N0 2 ，N0 2 是红棕色、有刺激性气味的有毒气体。 【作出猜想】猜想一：气体可能是氢气、红色固体是金属氧化铁；猜想二：气体可能是氢气、 红色固体是；猜想三：气体可能是二氧化碳、红色固体是。 【交流讨论】大家思考后，一致认为猜想一和三不合理，其理由是_____________________。 【实验与结论】 实验步骤 现象 结论 （1）取少量红色固体于一支洁净的试管中，加入稀盐酸 __________________________________ 猜想一不成立 （2）①用尖嘴导管将气体导出并引燃，同时在上方放一块干冷的玻璃片 ②取少量红色固体于一支洁净的试管中，加入稀硝酸 该气体能燃烧，且玻璃片上有______出现 红色固体溶解，得到蓝色溶液同时看到试管上部有红棕色气体产生 猜想二成立 【继续探究】 （1）用pH试纸测得氯化铜溶液pH约为4，说明氯化铜溶液中含有较多的________离子。 （2）取7.68g 红色固体，加入100g稀HNO 3 溶液，如恰好完全反应，计算生成NO的质量(化学方程式见上)和反应前稀HNO 3 溶液中溶质的质量分数。 (请写出计算过程)
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【简答题】A college education is more and more seen as a means for economic betterment rather than a means for human betterment. This is a trend that is likely to persist and even accelerate.
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石膏掺量
B.
水泥细度
C.
温度、湿度
D.
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【单选题】Why does the author say that a college education is more and more seen as a means for economic betterment rather than a means for human betterment?
A.
Because it is a trend that is likely to persist and even accelerate.
B.
Because the students increasingly are toward the majors which they bet would lead to employment.
C.
A Because the cost of tuition is rising.
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A.
go
B.
drive
C.
persist
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stuff
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A.
正确
B.
错误
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【单选题】This is a trend that is likely to persist and even accelerate. (Para. 2) what is the trend?
A.
Students have increasingly shouldered the ever-rising cost of tuition.
B.
Students have defected from the study of the humanities and toward applied science and "hard skills".
C.
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【单选题】To persist means:
A.
to give up casily
B.
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to forget
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to give up easily
B.
to keep doing something
C.
to forget
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【单选题】听力原文：W: Why does John persist in talking of another job? M: I think it means he wants a rise in pay. What do we know about John?
A.
He likes talking about his job.
B.
He intends to have a pay raise.
C.
He means to change to another job.
D.
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【简答题】A college education is more and more seen as a means for economic betterment rather than a means for human betterment. This is a trend that is likely to persist and even accelerate.
查看完整题目与答案
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【多选题】影响硅酸盐水泥技术性质的因素一般包括（）
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【单选题】Why does the author say that a college education is more and more seen as a means for economic betterment rather than a means for human betterment?
A.
Because it is a trend that is likely to persist and even accelerate.
B.
Because the students increasingly are toward the majors which they bet would lead to employment.
C.
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查看完整题目与答案
【单选题】Which of tghe following words means "things that make us want to go and sell"
A.
go
B.
drive
C.
persist
D.
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【判断题】知识与能力是小学语文学习的重点,过程与方法是小学语文学习的基础,情感态度与价值观是小学语文学习的保证。
A.
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B.
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查看完整题目与答案
【单选题】This is a trend that is likely to persist and even accelerate. (Para. 2) what is the trend?
A.
Students have increasingly shouldered the ever-rising cost of tuition.
B.
Students have defected from the study of the humanities and toward applied science and "hard skills".
C.
A college education is more and more seen as a means  for economic betterment rather than a means for human betterment.
查看完整题目与答案
【单选题】To persist means:
A.
to give up casily
B.
to keep doing something
C.
to forget
查看完整题目与答案
【单选题】To persist means
A.
to give up easily
B.
to keep doing something
C.
to forget
查看完整题目与答案
【单选题】听力原文：W: Why does John persist in talking of another job? M: I think it means he wants a rise in pay. What do we know about John?
A.
He likes talking about his job.
B.
He intends to have a pay raise.
C.
He means to change to another job.
D.
He is persistent in his own job.
查看完整题目与答案