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问题 选择题

下列四个命题：①一组对边平行且一组对角相等的四边形是平行四边形；②对角线互相垂直且相等的四边形是正方形；③顺次连结矩形四边中点得到的四边形是菱形；④正五边形既是轴对称图形又是中心对称图形，其中真命题共有[ ]

A.1个      

B.2个        

C.3个        

D.4个

答案

答案：B

阅读理解

CONTEST RULES
·Entries may be submitted(上交) no earlier than January 1, 2008, and will not be accepted until three winners are identified or December 31, 2008 whichever comes first.
·There is no cost to enter.
·Entrants must be at least 18 years of age.
·Any form and style is acceptable for this competition: fiction, observational essay, humor, etc. poetry is not acceptable.
·Total length of writing must be 500-1500 words, including any necessary notes or citations.
·Writing must be original, never before published, and entirely the work and property of the person who submits it. Ghostwritten is not acceptable.
PRIZES
Winners will receive
·$50 cash
·Professional editing of their winning entries.
·Publication of their entries in Word-wise.
·Recognition via press releases announcing the winning entries and introducing the authors.
HOW TO ENTER
·Save your completed writing as a Word, WordPerfect, Open Document, or plain text file.
·Title the file with your first and last name. For example, Elton Smith would title his Word document thus: elton-smith.doc.
·Email the file as an attachment to contest2008@adminmaven.com. Use the subject line “Work-wise Writing Contest” to avoid being removed to the span bin.
·Entries submitted before the opening date of January1, 2008, will be deleted. Once the contest closes, further entries will be deleted.
 
小题1:Ghostwritten work in “CONTEST RULES” might be ________.
a. written by someone other than the author
b. science fiction difficult to understand
c. a long essay in a very strange writing style
d. full of citations from other writers
小题2:To enter the writing contest, one ________.
a. has to pay a fee
b. must submit work by January 1, 2008
c. needs an eye-catching title for his word document
d. can submit any form or style of writing but a poem
小题3:Which of the following is NOT TRUE?
a. The final results will come out on December 31, 2008.
b. All entries must be emailed to contest2008@adminmaven.com.
c. One can not add a note to a 1,500-word essay for the contest.
d. the winning entries will be edited and published.
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单项选择题

人体内合成尿素的主要脏器是

A．脑
B．肌肉
C．肾
D．肝
E．心
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