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What is PET?
The Cambridge Preliminary(预备的) English Test (PET) is the second level of the Cambridge exams in English for Speakers of Other Languages, that is, people who do not speak English. It is an intermediate(中级的) level exam. PET recognizes the ability to cope with everyday written and spoken communications.
Who is PET for?
PET is designed for people whose English is adequate(足够的) for many practical purposes, including work, study and social situations.
Candidates should have a wide grasp of vocabulary and be able to use appropriate communication styles for a variety of situations.
PET is taken by more than 80,000 people each year in more than 80 countries, and is a valuable qualification for anyone who wants to work or study abroad or to develop a career in international business.
Why choose PET?
PET covers the four main language skills—reading, writing, listening and speaking, as well as testing grammar and vocabulary. It therefore provides evidence of practical skills. Studying for PET is a popular way to improve your language skills and use them in a wide range of contexts(上下文). PET is recognized by many employers and educational institutions as proof of intermediate level English skills.

Full name of PET: the Cambridge【46】
Level of the exam:【47】
Designed for: speakers of【48】
Requirements for candidates: 1) a large【49】, and
2) the ability to【50】in various situations

A.
Who
B.
C.
D.
Why
E.



【参考答案】

Preliminary English Test
Preliminary English Test
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One of the great mystery of modern biology is how 【M1】______proteins—the strings of amino acids that are the substanceof all living things—fold into precise and complex shapeswhen they created inside living cells. 【M2】______Proteins snap into their predestined shape withinmicroseconds, but the multistep process by which they doso is so complicated that this would take a powerful computer【M3】______centuries to come up a model for how it is done. 【M4】______Recently, however, some very smart chemists atStanford University and the University of Illinois borrowedan idea from the SETI (Search for ExtraterrestrialIntelligence) project to find an alternate solution. 【M5】______The SETl @ home project divvies out to 4 million PCowners chunks of raw data from the giant Arecibo radiotelescope in Puerto Rico. Those PCs, in its idle moments, 【M6】______filter this electronic noise for telltale signs of another civilizationin the cosmos, and then ship the results back to SETI. Folding@ home, the brainchild of Stanford biophysics ProfessorVijay Pende, similar parcels out the protein folding 【M7】______computations among 43,000 active PC-owning volunteers.In Sunday's online version of the British journal Nature,Pende reported success. The 'distributed computing'system has modeled how a man-made chain of 23 aminoacids called BBA5 snap into shape over the course of 6 【M8】______microseconds matched the time it takes the protein to 【M9】______form. and fold in the lab.The PC network already is at work deciphering thefolding of real human proteins and may one day ravel 【M10】______just what goes wrong in misshapen proteins believedresponsible for afflictions such as Creutzfeldt-Jakob andAlzheimer's disease.【M1】