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单词拼写
根据提示完成句子。
1.政府已经把那个地方变成了购物中心。
The _________ has _______ the place _______ a shopping centre.
2.香港的交通和北京的不一样。
The traffic in Hong Kong is _______ ______ _______ in Beijing.
3.你正计划去国外旅游么?
Are you _______ ______ _______ _______ ?
4.我的表弟已经离开丹阳5天了。
My cousin ______ ______ ______ _______ Danyang since ______
_____ ______ .
5.球迷们兴奋地又是鼓掌又是尖叫
The football fans______ and ______ with _______ .
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根据提示完成句子。
1.政府已经把那个地方变成了购物中心。
The _________ has _______ the place _______ a shopping centre.
2.香港的交通和北京的不一样。
The traffic in Hong Kong is _______ ______ _______ in Beijing.
3.你正计划去国外旅游么?
Are you _______ ______ _______ _______ ?
4.我的表弟已经离开丹阳5天了。
My cousin ______ ______ ______ _______ Danyang since ______
_____ ______ .
5.球迷们兴奋地又是鼓掌又是尖叫
The football fans______ and ______ with _______ .
查看习题详情和答案>>
1用划线部分的反义词或对应词填空。
1. --Where do you want to go_? -- here, please. I can tell (告诉) you.
2. The pants are too . Do you have long ones?
3. She likes __ pants, but I like white ones.
4. The blue sweater is very small. I want a one!
5. We __ all kinds of things. What would you like to buy?
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一、制备K
s*5u二、提纯
方案1
方案2
主要试剂和产品的物理常数
| 名 称 | 相对分子质量 | 熔点或沸点（0C） | 水 | 醇 | 醚 |
| 水杨酸 | 138 | 158(熔点) | 微溶 | 易溶 | 易溶 |
| 醋酸酐 | 102 | 139.4(沸点) | 反应 | 可溶 | 易溶 |
| 乙酰水杨酸 | 180 | 135(熔点) | 微溶 | 可溶 | 微溶 |
（1）①合成阿斯匹林时，还会生成一些副产品，其中有一种是高分子，为了分离此物质，方案1中加入A物质为 ▲ 溶液。
②本方案抽滤后进行洗涤，其具体操作是 ▲ 。
（2）方案2为改进的提纯方法，称为重结晶提纯法。
①该方案中步骤1除了选用乙酸乙酯外，还可选择下列哪些
试剂 ▲ 。
A. 乙醇 B. 蒸馏水 C. 乙醚
②步骤2回流的装置如图所示，写出仪器a的名称 ▲ ，使用温度计的目的是 ▲ ，冷凝水的流向为 ▲ 。
③方案2所得产品的有机杂质要比方案1少的原因是 ▲ 。
（3）该学习小组在实验中原料用量：2.0g水杨酸、5.0ml醋酸酐（ρ＝1.08g·cm-3），
最终称量产品m="2.2g" ，则乙酰水杨酸的产率为 ▲ 。 查看习题详情和答案>>
Dragon -Boat Festival all also called the DuanWu Festival, is celebrated on the fifth day of the fifth month
according to the Chinese calendar. For thousands of years, the festival has been marked by eating Zong Zi and
racing dragon boats. To hold the dragon-boat races is in memory of Qu Yuan, one of the greatest poets (诗人)
in China.
Qu Yuan was born in Zigui of Hubei Province over 2,200 years ago. Qu Yuan was an honest minister
(大臣) of the State of Chu, during the Warring States Period (475-22 l BC) (战国时期). He was upright and
wise. He wanted to bring his country peace and make the state more stronger, but the country was in the hands
of bad officials,he failed．At last,he was very discouraged. (1) the Miluo River, throwing, he, into, himself, life,
by, his, ended. (2) 据说当时人们从船上跳下去试图救他. But it was too late. Also, they were very sad and
they threw rice into the water to feed Qu Yuan's spirit.
(3) Now we read his poem Li Sao which was filled with deep love for his country. We can see the
dragon-boat races and have a kind of Chinese food named Zone Zi to eat during the Dragon-boat Festival.
1. What are the two important things on the Dragon Boat Festival?
_______________________________________________________________
2. (1) 把划线部分的单词组成句子。
_______________________________________________________________
3. 将文中(2)处的汉语句子译成英语。
_______________________________________________________________
4. 把(3) 处划线部分译成汉语。
_______________________________________________________________
5. List the words that can describe the qualities (品质) of Qu Yuan. (at least 3)
_______________________________________________________________