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【简答题】
Ask someone what they have done to help the environment recently and they will almost certainly mention recycling.Recycling in the home is very important of course.However, being forced to recycle often means we already have more material than we need.We are dealing with the results of that over–consumption in the greenest way possible, but it would be far better if we did not need to bring so much material home in the first place. The total amount of packaging has increased by 12% between 1999 and 2005.It now makes up a third of a typical household’s waste in the UK.In many supermarkets nowadays food items are packaged twice with plastic and cardboard. Too much packaging is doing serious damage to the environment.The UK, for example, is running out of it for burying this unnecessary waste.If such packaging is burnt, it gives off greenhouse gases which go on to cause the greenhouse effect.Recycling helps, but the process itself uses energy.The solution is not to produce such items in the first place.Food waste is a serious problem, too.Too many supermarkets encourage customers to buy more than they need.However, few of them are coming round to the idea that this cannot continue, encouraging customers to reuse their plastic bags, for example. But this is not just about supermarkets.It is about all of us.We have learned to associate packaging with quality.We have learned to think that something unpackaged is of poor quality.This is especially true of food.But it is also applied to a wide range of consumer products, which often have far more packaging than necessary. There are signs of hope.As more of us recycle, we are beginning to realize just how much unnecessary materials are collected.We need to face the wastefulness of our consumer culture, but we have a mountain to climb. 小题1:What does the underlined phrase “that over-consumption” refer to? A.Using too much packaging. B.Recycling too many wastes. C.Making more products than necessary. D.Having more material than is needed. 小题2:The author uses figures in Paragraph 2 to show ___________. A.the tendency of cutting household waste B.the increase of packaging recycling C.the rapid growth of supermarkets D.the fact of packaging overuse 小题3:According to the text, recycling ___________. A.helps control the greenhouse effect B.means burning packaging for energy C.is the solution to gas shortage D.leads to a waste of land 小题4:What can be inferred from Paragraph 4? A.Unpackaged products are of bad quality. B.Supermarkets care more about packaging. C.It is improper to judge quality by packaging. D.Other products are better packaged than food.
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【单选题】What kind of countries are mostly present-oriented?
A.
Asian countries
B.
Muslin countries
C.
European countries
D.
American countries
【简答题】EOP的最大值是
【单选题】关于心脏传导系统的描述哪项错误
A.
心脏传导系统由特殊的心肌纤维形成
B.
心脏传导系统包括窦房结、房室结、房室束及其束支
C.
心脏传导系统均位于心内膜下层
D.
心脏传导系统的功能是协调心房和心室按一定节律收缩
E.
心脏传导系统中,窦房结位于右心房心外膜深部
【单选题】基因翻译为蛋白质的调节因素和环节不包括哪项
A.
基因转录为mRNA    
B.
转录后mRNA的加工
C.
mRNA转化为DNA    
D.
翻译为蛋白质
E.
蛋白质的修饰
【单选题】mRNA的转录后加工不包括
A.
5’端加入7-甲基鸟苷三磷酸
B.
3’端加poly A
C.
切除内含子,连接外显子
D.
碱基修饰
E.
加CCA尾
【简答题】鸡卵清蛋白基因为7700bp,经转录后加工从前体分子中剪去内含子,拼接成1872nt的成熟mRNA,其中卵清蛋白的编码序列含11nt(包括一个终止密码子)。如果戴帽和内部修饰消耗的能量忽略不计,计算从转录出mRNA前体到最后加工成一个成熟的卵清蛋白mRNA(假定3′端还有200个腺苷酸残基组成的尾巴)需要消耗多少分子ATP?
【单选题】原核生物tRNA的转录后加工不包括以下哪一项
A.
3’端需添加为CCA-OH
B.
切除多余的核苷酸序列
C.
对特点碱基进行修饰
D.
核酸酶将tRNA切割成大小不一的片段
【单选题】有关RNA编辑(editing)的描述,不正确的是( )。
A.
改变了DNA所编码的遗传信息
B.
是mRNA转录后加工的一个正常现象
C.
在原核及真核生物中都有存在
D.
编辑的方式包括碱基的修饰及核苷酸的插入或缺失
【单选题】What kind of present did Marley give his granddaught this year?
A.
Lots of candy.
B.
A check.
C.
Clothes.
D.
A lot of toys.
【单选题】What kind of language can best present your purpose in a piece of description?
A.
language reflecting five senses
B.
body language
C.
sign language
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