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【单选题】
根据下列短文，回答下列各题。 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．
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参考解析：
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【单选题】某品牌服装折扣店将某件衣服按进价提高50%后标价，再打8折（标价的80%）销售，售价为240元．设这件衣服的进价为x元，根据题意，下面所列的方程正确的是（ ）
A.
x?50%×80%=240
B.
x?（1+50%）×80%=240
C.
240×50%×80%=x
D.
x?（1+50%）=240×80%
【单选题】"Cool" is a word with many meanings. Its old meaning is used to express a temperature that is a little bit cold. As the world has changed, the word has had many different meanings. "Cool" can be used...
A.
be the same color as
B.
hide defects in
C.
go well with
D.
serve as a contrast to
【多选题】根据我国《合同法》的规定,在( )情形下,要约失效。
A.
拒绝邀约的通知到达要约人。
B.
要约人依法撤销要约。
C.
承诺期限届满，受要约人未作出承诺。
D.
受要约人对要约的内容作出实质性变更
E.
要约人依法撤回要约