In this passage the author mainly argues that housing _____.
A. is a problem that can be solved socially
B. is a heavy burden for most underprivileged families
C. is a widespread problem in some European countries.
D. changes with social conditions.
建设项目总结评价是项目建设完工投产后，由建设项目（）对建设情况进行的全面系统总结和自我评价，并以《建设项目总结评价报告》（简称“自评报告”）形式提出。
A. 经理
B. 工人
C. 投资人
D. 业主
水泥稳定土类材料自拌和至摊铺完成，不得超过( )h。
A. 6
B. 5
C. 4
D. 3
The original kites were used ______.
A. as a way to have a fun
B. as a signal
C. in religious ceremonies
D. as tools for study weather
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