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阅读理解 When Milk Arrived on the Doorstep When I was a boy growing up in New Jersey in the 1960s, we had a milkman delivering milk to our doorstep.His name was Mr Basille.He wore a white cap and drove a white truck.As a 5yearold boy, I couldn't take my eyes off the coin changer fixed to his belt.He noticed this one day during a delivery and gave me a quarter out of his coin changer. Of course, he delivered more than milk.There was cheese, eggs and so on.If we needed to change our order, my mother would pen a note'Please add a bottle of buttermilk next delivery'and place it in the box along with the empty bottles.And then, the buttermilk would magically appear. All of this was about more than convenience.There existed a close relationship between families and their milkmen.Mr Basille even had a key to our house, for those times when it was so cold outside that we put the box indoors, so that the milk wouldn't freeze.And I remember Mr Basille from time to time taking a break at our kitchen table, having a cup of tea and telling stories about his delivery. There is sadly no home milk delivery today.Big companies allowed the production of cheaper milk, thus making it difficult for milkmen to compete.Besides, milk is for sale everywhere, and it may just not have been practical to have a delivery service. Recently, an old milk box in the count ryside I saw brought back my childhood memories.I took it home and planted it on the back porch (门廊).Every so often my son's friends will ask what it is.So I start telling stories of my boyhood, and of the milkman who brought us friendship along with his milk. 1. Mr Basille gave the boy a quarter out of his coin changer________. A. to show his magical power B. to pay for the delivery C. to satisfy his curiosity D. to please his mother 2. What can be inferred from the fact that the milkman had the key to the boy's house? A. He wanted to have tea there. B. He was a respectable person. C. He was treated as a family member. D. He was fully trusted by the family. 3. Why does home milk delivery no longer exist? A. Nobody wants to be a milkman now. B. It has been driven out of the market. C. Its service is getting poor. D. It is forbidden by law. 4. Why did the author bring back home an old milk box? A. He missed the good old days. B. He wanted to tell interesting stories. C. He needed it for his milk bottles. D. He planted flowers in it.
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举一反三
【单选题】下列过程中系统的熵减少的是 ( )
A.
900OC时CaCO3(s)→CaO(S)+CO2(g)
B.
0OC、常压下水结成冰
C.
想气体的恒温膨胀
D.
在其正常沸点气化
【单选题】下列过程中系统的熵减少的是 。
A.
在900 O C时CaCO 3 (s) →CaO(s)+CO 2 (g);
B.
在0 O C、常压下水结成冰;
C.
理想气体的定温膨胀;
D.
水在其正常沸点气化。
【单选题】下列有关溶液(固体溶质)的叙述正确的是(  )
A.
不饱和溶液转化为饱和溶液,溶液中溶质的质量分数一定增大
B.
将5g某物质完全溶解于95g水中,所得溶液中溶质的质量分数不一定是5%
C.
任何物质的饱和溶液当温度降低时一定会析出晶体
D.
饱和溶液析出晶体后,剩余溶液中溶质的质量分数一定减小
【简答题】已知Zn和Ge在Cu中的最大溶解度(摩尔分数)分别为38%、12%;①计算两元素在最大溶解度时固溶体的电子浓度;②由计算结果可以看出何种规律?
【单选题】右图是a、b两种固体物质的溶解度曲线图,下列说法中不正确的是(  )
A.
任何温度下,a的溶解度大于b的溶解度
B.
a的溶解度受温度变化的影响比b的大
C.
t 1 ℃至t 2 ℃之间b曲线以下区域为a、b两物质的不饱和溶液
D.
对于a与b混合溶液,可利用冷却结晶的方法来分离
【单选题】甲醛的嗅阈值为()mg/m3。
A.
0.5-10
B.
0.06-1.2
C.
0.2-1.8
D.
0.1-1.9
【单选题】下列过程中系统的熵减少的是()
A.
在900℃时CaCO 3 (s)→CaO(S)+CO 2 (g)
B.
在0℃、常压下水结成冰
C.
理想气体的恒温膨胀
D.
水在其正常沸点气化
【单选题】下图是a、b两种固体物质的溶解度曲线图,下列说法中不正确的是 [     ]
A.
任何温度下,a的溶解度大于b的溶解度
B.
a的溶解度受温度变化的影响比b的大
C.
t 1 ℃至t 2 ℃之间b曲线以下区域为a、b两物质的不饱和溶液
D.
对于a与b混合溶液,可利用冷却结晶的方法来分离
【单选题】下列蛋白质中,除()外都是红细胞膜骨架蛋白:
A.
血影蛋白
B.
锚定蛋白
C.
带 3 蛋白
D.
血型糖蛋白
【单选题】下列过程中系统的熵减少的是 。
A.
在900 O C时CaCO 3 (s) →CaO(s)+CO 2 (g);
B.
在0 O
C.
常压下水结成冰; C、 理想气体的定温膨胀;
D.
水在其正常沸点气化。
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