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问题 填空题

（4分）请写出四种有机化合物的分子式，这些化合物燃烧后产生的CO2和H2O（g）的体积比符合如下比值（各写两种）：

（1）V（CO2）/V（H2O气）＝2的有                          。

（2）V（CO2）/V（H2O气）＝0.5的有                        。

答案

（1）C2H2  C6H6  C8H8   （2）CH4  CH3OH  CO（NH2）2

（1）V（CO2）/V（H2O气）＝2，说明有机物中碳原子和氢原子的个数之比是1︰1的，因此可以是C2H2、C6H6、C8H8等。

（2）V（CO2）/V（H2O气）＝0.5，说明有机物中碳原子和氢原子的个数之比是1︰4的，因此可以是CH4、CH3OH、CO（NH2）2等。

阅读理解

From:
<joseph_yana@orange.net> 
IP Address:
193.252.22.118 (originates from France) 
Date:
Mon, 02-Feb-2009 09:37:04am 
Attachment:
(No attachment)
Subject:
[G-Spam] PLEASE REPLY BACK. 
Message:
CONFIDENTIAL BUSINESS PROPOSAL.
FROM THE DESK OF: MR. JOSEPH YANA.
AFRICAN DEVELOPMENT BANK (ADB)
BURKINA-FASO.
Dear Sir / Madam,
I am the Bill and Exchange (assistant) Manager of the Africa development Bank, MR. JOSEPH YANA.
In my department I discovered an abandoned sum of USD$9.900.000 in an account that belongs to one of our foreign customer who died along with his wife and two children in July 2000 in a plane crash. Since we got information about his death, we have been expecting his next of kin(近亲属) to come over and claim his money, but unfortunately we learnt that all his supposed next of kin or relation died alongside with him in the plane crash leaving nobody behind for the claim.
It is therefore upon this discovery that I in my department now decided to make this business proposals to you and release the money to you as next of kin or relation since nobody is coming for it and we don't want this money to go into the bank treasury as unclaimed fund. The banking law and guidelines here says that if such money remains unclaimed after ten years, the money will be transferred into the bank treasury.
The request of foreigner in this transaction is necessary because our late customer was a foreigner. We agree that 30% of this money will be for you as foreigner partner, 5% will be set aside for expenses incurred during the business and 65% would be for me, after which I shall visit your country for disbursement(开支) according to the percentages indicated. Therefore to enable the immediate transfer of this fund to you as arranged, you must apply first to the bank, and send your account number, your private telephone and fax number for easy and effective communication and location where the money will be sent.
Upon receiving your reply, I will send to you by fax or e-mail the text of the application which you shall retype and fax to us. Trusting to receive your urgent reply through my alternative Email : jyana96 @ yahoo.co.id
Best regards.
MR. JOSEPY YANA.
1. A foreigner who receives this letter should ________.
A. be a close relative of the dead.               B. send hundreds of dollars to Africa
C. go to African Development Bank for the wealth  D. not take it seriously.
2. Which of the following is true according to the text?
A. Many millionaires died in the plane crash.    B. Any money unclaimed will be given to a poor foreigner.
C. the division of the money seems quite reasonable. D. AFRICAN DEVELOPMENT BANK doesn’t exist at all.
3. A person who believes “__________” will fall into it.
A. Nothing ventured, nothing gained.      B. There's no such thing as a free lunch.
C. All rivers run into the sea             D. A short cut is often a wrong cut
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单项选择题

以上哪种类型是根据阻生第三磨牙的长轴与第二磨牙长轴的关系而进行的分类

A．第Ⅱ类阻生
B．第Ⅲ类阻生
C．中位阻生
D．低位阻生
E．倒置阻生
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