2022年专四填空题训练(10)

发布时间:2022-01-14


专四专八考试的时间越来越近,51题库考试学习网给大家分享的一些针对考试的相关内容,希望能够对大家的专四专八考试备考有所帮助。

A novel way of making computer memories, using bacteria Forhalf a century, the (1) __________of progress in the computer industry has been to do more with less.

Moore\'s law famously observes that the number of transistors which can be crammed into a given space (2)__________ every 18 months.

The amount of data that can be stored has grown at a similar rate.

Yet as (3)__________ get smaller, making them gets harder and more expensive.

On May 10th Paul Otellini, the boss of Intel, a big American chipmaker, put the price of a new chip factory at around $10 billion.

Happily forthose that lack Intel\'s resources, there may be a cheaper option—namely to mimic Mother Nature,

who has been building tiny (4)__________, in the form of living cells and  their components, forbillions of years, and has thus got rather good at it.

A paper published in Small, a nanotechnology journal , sets out the latest example of the (5)__________.

In it, agroupof researchers led by Sarah Staniland at the University of Leeds, in Britain, describe using naturally occurring proteins to make arrays of tiny magnets,

similar to those employed to store information in disk drives.

The researchers took their (6)__________ from Magnetospirillum magneticum, a bacterium that is sensitive to the Earth\'s magnetic field thanks to the presence within its cells of flecks of magnetite, a form of iron oxide.

Previous work has isolated the protein that makes these miniature compasses. Using genetic engineering, the team managed to persuade a different bacterium—Escherichia coli, a ubiquitous critter that is a workhorse of biotechnology—to (7)__________ this protein in bulk.

Next, they imprinted a block of gold with a microscopic chessboard pattern of chemicals.

Half the squares contained anchoring points forthe protein.

The other half were left untreated as controls.

They then dipped the gold into a solution containing the protein, allowing it to bind to the treated squares, and dunked the whole lot into a heated (8)__________ of iron salts.

After that, they examined the results with an electron microscope.

Sure enough, groups of magnetite grains had materialised on the treated squares, shepherded into place by the bacterial protein.

In principle, each of these magnetic domains could store the one orthe zero of a bit of information, according to how it was polarised.

Getting from there to a real computer memory would be a long road.

Fora start, the grains of magnetite are not strong enough magnets to make a useful memory, and the size of each domain is huge by modern computing (9)__________.

But Dr Staniland reckons that, with enough tweaking, both of these objections could be dealt with.

The (10)__________ of this approach is that it might not be so capital-intensive as building a fab.

Growing things does not need as much kit as making them.

If the tweaking could be done, therefore, the result might give the word biotechnology a whole new meaning.

A) components

B) advantage

C) standards

D) compliments

E) essence

F) inspiration

G) disadvantage

H) doubles

I) solution

J) resolution

K) devices

L) manufacture

M) spirit

N) product

O) technique

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下面小编为大家准备了 专四专八考试 的相关考题,供大家学习参考。

What is Wilmington like now?

A.It's a prosperous city.

B.It has many veterans of war.

C.Its pretty buildings have been torn down.

D.It is no longer an agreeable place.

正确答案:D

SECTION A MINI-LECTURE

Directions: In this section you sill hear a mini-lecture. You will hear the lecture ONCE ONLY. While listening, take notes on the important points. Your notes will not be marked, but you will need them to complete a gap-filling task after the mini-lecture. When the lecture is over, you will be given two minutes to check your notes, and another ten minutes to complete the gap-filling task on ANSWER SHEET ONE. Use the blank sheet for note-taking.

听力原文: Good morning, everyone. First about your second assignment. I'd like to remind you that your second assignment should be in by next Fri day. You can either put it in my pigeon hole, or leave it with the Department's secretary. Now, let's get down to the lecture.

Today, the lecture is on credit, er, or to be more specific, on credit cards. I'm sure you must have heard of some credit cards, like the VI SA card, which is an internationally used card, or the Great Wall card issued by the Bank of China, In order to give a better understanding, we'll discuss it in some detail.

Many businesses, such as department stores, restaurants, hotels and airline companies, use a credit system for selling their products and services. In a credit system, the seller agrees to sell something to the buyer without immediately receiving cash. He receives the goods or ser vices immediately and promises to pay for them later. This buy-now-pay later credit system is quite old.

There are two types of credit cards. One type is issued directly by a store to a customer. Many large department stores issue credit cards to their customers. The store credit card can be used to make purchases only at a particular store. For example, if you have a credit card from Store A, then you can only buy things in that store. Other stores would not accept it. The other kind of credit card is issued by a credit company. Credit cards from credit companies can be used to buy things almost anywhere. If you have a major credit card, you can buy airplane tickets, stay at hotels and eat at restaurant with it. Most large credit companies are connected to large banks. So if you want a credit card from a credit company, you generally have to make an application at a bank. After an applicant receives a credit card, he or she can make purchases using the

card.

The credit company sends the customer a statement of purchases at the end of each month. Generally the customer has to pay 25--50% of their credit hill every month. The customer pays directly to the credit company and the credit company pays to the store or hotel or restaurant.

There are some advantages and some disadvantages to using credit cards. The biggest advantage for the consumer is expressed by the phrase "buy now, pay later". This means that the consumer can purchase what he wants when he wants it. There is no need to save up money in advance. Another advantage of having a credit card is that it protects the owner, ff a credit card is lost or stolen, the owner only has to call the credit company and the credit company will stop the credit card number. No one else can use it. So the owner doesn't have to worry about losing the card. Another advantage of the credit card system is that the consumer receives a record of his or her purchases. Every month the credit customer receives a bill. The bill has a list of all purchases from that month. This makes it easier to remember when and where purchases are made. And another advantage is that credit cards can be used when something unexpected happens. Many kinds of professional people—plumbers, taxidrivers, doctors and dentists—will accept credit cards in an emergency. This is very important if you don't have any cash with you.

However, having said all that, using credit cards has one major disadvantage. That is, consumers tend to overspend their money. They spend more than they make. If a consumer buys a lot of th

正确答案:limited/ restricted/ exclusive/ area-limited/ restrictive
limited/ restricted/ exclusive/ area-limited/ restrictive

SECTION C NEWS BROADCAST

Directions: In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. At the end of each news item, you will be given 10 seconds to answer the questions.

听力原文: The cancellation of the 16-day flight means that the crew and scientists on the ground are pursuing only their most important experiments in the few remaining hours left before the shuttle laboratory is closed. The US sapce agency NASA decided Sunday to bring the orbiter home 12 days early because of fears of weakened power generator could explode. The generator has been turned off, leaving the shuttle with only two thirds of its normal power supply. To conserve electricity for the experiments the crew is working in dimmer lighting than normal and has turned off all unessential equipment. NASA says the two remaining generators are sufficient for Tuesday's landing, but had nevertheless ordered the astronauts to study emergency procedures in case another fails. The shuttle team has expressed its disappointment at the curtailment of the science mission, and says enough data have already been collected in the materials, combustion and biological experiments to push science further ahead. The scientist' goal is to complete the experiments on a later shuttle flight. David Batlery, VOA news, Washington.

Why did NASA decide to bring the shuttle home earlier?

A.The laboratory was closed.

B.The generator was turned off.

C.The power generator might explode.

D.Electricity was going to run out.

正确答案:C

【M4】

正确答案:opposite改成the opposite
opposite改成the opposite 解析:opposite前有限制性的定语just来形容,故要加定冠词。

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