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51、 Many people believe that viruses cannot possibly be of importance in human cancer
because_________．
A．they are innocuous agencies
B．they are the causative agents of most human cancer
C．they seem to be infections to many people
D．they are generally thought to be relevant to most cancer in mall


52、 The best title for this passage is_________．
A．New Light on the Cause of Cancer
B．The Newest Theory on the Nature of Viruses
C．Viruses and Cancer
D．On the Nature of Life


53、根据下列短文，回答53-72题。
　　During the SUmmer session there will be a revised schedule of services for the universitycommunity．Specific changes for intercampus bus services，the cafeteria，and summer hours forthe infirmary(医务室)and recreational and athletic facilities will be posted on the bulletin 60 ard outside of the cafeteria．Weekly movie and concert schedules which are in the process ofbeing arranged will be posted each Wednesday outside of the cafeteria.
　　Intercampus buses will leave the main hall every hour on the half hour and make all of theregular stoDs on their route around the campus．The cafeteria will serve breakfast，lunch，andearly dinner from 7 a．m．to 7 P．m．during the week and from noon to 7 P．m．on weekends．Thelibrary will maintain regular hours during the week，but shorter hours on Saturdays and Sun—days．The weekend hours are from noon t0 7 P.m..
　　AU students who want to use the library borrowing services and the recreational，athletic，and entertainment facilities must have valid summer identification cards．This announcementwill also appear in the next issue of the student newspaper．
Which of the following is the main purpose of this announcement?
A．To tell campus personnel of the new library services．
B．To announce the new movies on campus this summer．
C．To notify university people of important schedule changes．
D．To remind students to validate(使生效)their identification cards．


54、 Specific schedule revisions for which of the following facilities are listed in this an nouncement?
A．Athletic and recreational．
B．Food and transportation．
C．B00kstore and post office．
D．Medical and audio-visual(视听的)．


55、 Times for movies and concerts are not listed in this announcement because________.
A．a film or concert OCCUrs every Wednesday at 7 P．m．
B．the full list would be too long
C．films and concerts cannot be announced publicly
D．the full list is not ready yet


56、 According to the announcement，which of the following is true of special summer hours for the library?
A．It has them only on the weekends．
B．It has them beth weekdays and weekends．
C．It has no special summer hours．
D．This information iS not available．


57、根据下列短文，回答57-76题。
　　Table top magic requires no secret formula．Even the simplest meal will be received?withenthusiasm if the table accessories are creative and colorful．No matter what type of dinnerwareyou own．you call enhance its beauty with a variety of attractive table linens．
　　When selecting a supply of tablecloths，place mats and napkins，choose easy-care or per-manentpress fabrics because these fabrics will reduce your workload when washday rolls a．round．Another consideration is the suitability of your hnens for your dining style or the types ofentertaining you d0．The shape of your table will also dictate the kind of tablecloth you pur-chase．Circular or rounded tables look best covered with round or oval tablecloths．Square-cor-nered tables require squares or rectangles．
　　Finally，your table linens should complement your dinnerware．An elegant table settingrequires an elegant tablecloth．A setting of stoneware looks best with heavy of colorful fabrics．But sure to take all the necessary measurements before you start shopping for fabric fo yourchoice．It could be embarrassing if your tablecloths are not long enough to cover the tables．Itis equally distressing if your tablecloth is so long that your guests have to watch where theywalk．
Linens should complement your dinnerware．The underlined word means
A．be the same color as
B．hide defects in
C．go well with
D．serve as a contrast to


58、 The author suggests that you purchase table linens made of________．
A．bleach-safe fabric
B．preshrunk cloth
C．easy-care material
D．stain-resistant coRon


59、 Which size tablecloth would you buy for a circular table which is 30 inches hish and 45 inches in diameter?
A．45-inch round．
B．50-inch round
C．70-inch round
D．120-inch round


60、 From this passage，we can conclude that table top________．
A．is important for meal service
B．is a magic
C．should be colorful
D．should be made only by certain material