正确答案:

题目：构成纤维膜后部的是 （　　）

解析：略

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学习资料的答案和解析：

[单选题]“寡而患不均，不患贫而患不安”一句出自 ( )《韩非子》《庄子》《论语》《孟子》

先破后立

[单选题]

[单选题]What job will be done the day before the festival begins?

回答下面的题目Student Volunteers Needed!On Saturday, December 12th,from 10 A．M．until 4 P． M． , Carverton Middle School will be holding a music festival in the school gymnasium． The special event will feature a variety ofprofessional musicians and singers．TaskTimeDateMake posters1 P．M．一4 P．M．December 5thSet up gym11 A．M．一4 P．M．December 1thHelp performers9 A．M．一4 P．M．December 12thWelcome guests10 A．M．一2 P．M．December 12thClean up gym4 P．M．一7 P．M．December 12thInterested students should speak with Ms．Braxton,the music teacher．Students who would like to help at the festival must have written permission from a parent or guardian．What time will the festival begin?

Setting up the gym．

解析：音乐节的头一天应该做什么。12日举行音乐节，头一天应是11日。表格的第二行，把体育馆布置好。选项B是正确的。

[单选题]根据下列短文，回答{TSE}题。　　There are various in which individual economic units Can interact with one another．Three basic ways may be described as the market system，the administered system and the traditional system．In a market system individual economic units are free to interact among each other in themarketplace．It is possible to buy commodities from other economic units or sell commodities tothem．In a market，transactions may take place via barter or money exchange．In a barter economy，real goods such as automobiles，shoes and pizzas are traded against each other．Obviously，finding somebody who wants to bade my old Car in exchange for a sailboat may not always bean easy task．Hence，the introduction of money as a medium of exchange eases transactions considerably．In the modern market economy，goods and services are bought or sold for money．　　An alternative to the market system is administrative control by some agency over all trans．actions．This agency will issue edicts or commands as to how much of each good and service should be produced，exchanged，and consumed by each economic unit．Central 01anaing may be one way of administering such an economy．The central plan，drawn up by the government,shows the amounts of each commodity produced by the various firms and allocated to differenthouseholds for consumption．This is an example of complete planing of production，consump—tion，and exchange for the whole economy．　　In a traditional society，production and consumption paUerns are governed by tradition：everyperson’S place within the economic system is fixed by parentage，religion and custom．　　　　　Transac—tions take place on the basis of tradition，too．People belonging to a certain group or caste mayhave an obligation to care for other persons，provide them with food and shelter，care for theirhealth，and provide for their education．Clearly，in a system where every decision is made on thebasis of tradition alone，progress may be difficult to achieve．A stagnant society may result．{TS}What is main purpose of the passage?

To outline contrasting types of economy．

[单选题]Oceania is a________ landmass．

B separate

[单选题]以下部位中，氧分压由高到低排列的是 （　　）

大气、肺泡、肺静脉血、肺动脉血

[多选题]关于胆囊收缩素（　　）

小肠上部I细胞分泌

促进胆囊的收缩

[单选题]中枢化学感受器最敏感的直接刺激物是（　　）

脑脊液中的H+