Mr. Perkin stood at the bus-stop and watched the cars p? by

separated
不是很清楚要填什么意思的词

相信你会喜欢这篇短小的小说的.
Appointment With Love －－By Sulamith Ish-Kishor
Six minutes to six, said the great round clock over the information booth in Grand Central Station. The tall young Army lieutenant who had just come from the direction of the tracks lifted his sunburned face, and his eyes narrowed to note the exact time. His heart was pounding with a beat that shocked him because he could not control it. In six minutes, he would see the woman who had filled such a special place in his life for the past 13 months, the woman he had never seen, yet whose written words had been with him and sustained him unfailingly.
He placed himself as close as he could to the information booth, just beyond the ring of people besieging the clerks...
Lieutenant Blandford remembered one night in particular, the worst of the fighting, when his plane had been caught in the midst of a pack of Zeros. He had seen the grinning face of one of the enemy pilots.
In one of his letters, he had confessed to her that he often felt fear, and only a few days before this battle, he had received her answer: "Of course you fear...all brave men do. Didn't King David know fear? That's why he wrote the 23rd Psalm. Next time you doubt yourself, I want you to hear my voice reciting to you: 'Yea, though I walk through the valley of the shadow of death, I shall fear no evil, for Thou art with me.'" And he had remembered; he had heard her imagined voice, and it had renewed his strength and skill.
Now he was going to hear her real voice. Four minutes to six. His face grew sharp.
Under the immense, starred roof, people were walking fast, like threads of color being woven into a gray web. A girl passed close to him, and Lieutenant Blandford started. She was wearing a red flower in her suit lapel, but it was a crimson sweet pea, not the little red rose they had agreed upon. Besides, this girl was too young, about 18, whereas Hollis Meynell had frankly told him she was 30. "Well, what of it?" he had answered. "I'm 32." He was 29.
His mind went back to that book - the book the Lord Himself must have put into his hands out of the hundreds of Army library books sent to the Florida training camp. Of Human Bondage, it was; and throughout the book were notes in a woman's writing. He had always hated that writing-in habit, but these remarks were different. He had never believed that a woman could see into a man's heart so tenderly, so understandingly. Her name was on the bookplate: Hollis Meynell. He had got hold of a New York City telephone book and found her address. He had written, she had answered. Next day he had been shipped out, but they had gone on writing.
For 13 months, she had faithfully replied, and more than replied. When his letters did not arrive she wrote anyway, and now he believed he loved her, and she loved him.
But she had refused all his pleas to send him her photograph. That seemed rather bad, of course. But she had explained: "If your feeling for me has any reality, any honest basis, what I look like won't matter. Suppose I'm beautiful. I'd always be haunted by the feeling that you had been taking a chance on just that, and that kind of love would disgust me. Suppose I'm plain (and you must admit that this is more likely). Then I'd always fear that you were going on writing to me only because you were lonely and had no one else. No, don't ask for my picture. When you come to New York, you shall see me and then you shall make your decision. Remember, both of us are free to stop or to go on after that - whichever we choose..."
One minute to six - Lieutenant Blandford's heart leaped higher than his plane had ever done.
A young woman was coming toward him. Her figure was long and slim; her blond hair lay back in curls from her delicate ears. Her eyes were blue as flowers, her lips and chin had a gentle firmness. In her pale green suit, she was like springtime come alive.
He started toward her, entirely forgetting to notice that she was wearing no rose, and as he moved, a small, provocative smile curved her lips.
"Going my way, soldier?" she murmured.
Uncontrollably, he made one step closer to her. Then he saw Hollis Meynell.
She was standing almost directly behind the girl, a woman well past 40, her graying hair tucked under a worn hat. She was more than plump; her thick-ankled feet were thrust into low-heeled shoes. But she wore a red rose in the rumpled lapel of her brown coat.
The girl in the green suit was walking quickly away.
Blandford felt as though he were being split in two, so keen was his desire to follow the girl, yet so deep was his longing for the woman whose spirit had truly companioned and upheld his own; and there she stood. Her pale, plump face was gentle and sensible; he could see that now. Her gray eyes had a warm, kindly twinkle.
Lieutenant Blandford did not hesitate. His fingers gripped the small worn, blue leather copy of Of Human Bondage, which was to identify him to her. This would not be love, but it would be something precious, something perhaps even rarer than love - a friendship for which he had been and must ever be grateful.
He squared his broad shoulders, saluted and held the book out toward the woman, although even while he spoke he felt shocked by the bitterness of his disappointment.
"I'm Lieutenant John Blandford, and you - you are Miss Meynell. I'm so glad you could meet me. May...may I take you to dinner?"
The woman's face broadened in a tolerant smile. "I don't know what this is all about, son," she answered. "That young lady in the green suit - the one who just went by - begged me to wear this rose on my coat. And she said that if you asked me to go out with you, I should tell you that she's waiting for you in that big restaurant across the street. She said it was some kind of a test. I've got two boys with Uncle Sam myself, so I didn't mind to oblige you."

苯甲酸自身的缩合也是碱性条件下的.形成负离子啊……酸性条件下怎么形成负离子.
聚合和cannizzaro的区别在于,聚合拔掉的是醛基活化掉的H,cannizzaro弄掉的是醛基上的H.
一般说来醛基上的H还是比较稳定的么……cannizzaro反应条件是热浓碱,挺难的

小题1:B
小题2:B
小题3:D
小题4:A
小题5:D

CABCD A

这个求助题,在手机上看到之后,在电脑上就直到今天才见到.因此,回答晚了.
我认为这是主系表
主系表和被动的区别,主系表表状态,被动强调结果
The glass is broken． （系表结构）,因为强调杯子坏了的状态
The glass was broken by the boy． （被动语态）,强调杯子被谁打坏了,强调打坏这个动作
我认为你的例句,是一种状态
还有一个区别：
如果句中有地点、频率或时间状语时,一般为被动语态.
例The door is locked． （系表结构）
The door has already/just been locked．（被动语态）
问词性,并不重要,因为,过去分词,也是形容词性

BDD

mr.perkin stood at the bus shop and w(atched )___观看__the cars go by.many of the cars were new bea400s,and most of them were yellow.mr.perkin always_wore穿__same clothes as other men,ate the same foo...

J Chem Soc Perkin Trans是英国皇家学会RSC下的期刊,因此属于RSC数据库.但是据本人所知,这个期刊已经停刊貌似.谷歌学术搜索一下,也是搜不到下载资源的.

因为段落中有句是his nearly instant recognition that the new dye had commercial possibilities,意思是他几乎是瞬间就意识到his new dye 有商机.
而问题问的是Perkin马上意识到他的new dye有什么潜力?根据我刚才讲解的那句话,答案就是commercial