一般人对苯硫腺感觉味苦，由基因B控制，也有人对其无味觉，叫味盲，由基因-我要搜题网

More than any other country, America defines itself by a collective dream: the dream of economic opportunity and upward mobility. Its proudest boast is that it offers a chance of the good life to everybody who is willing to work hard and play by the rules. This ideal has made the United States the world’s strongest magnet for immigrants; it has also reconciled ordinary Americans to the rough side of a dynamic economy, with all its inequalities and insecurities. Who cares if the boss earns 300 times more than the average working staff, if the staff knows be can become the boss
Look around the world and the supremacy of "the American model" might seem assured. No other rich country has so successfully harnessed the modern juggernauts of technology and globalization The hallmarks of American capitalism—a willingness to take risks, a light regulatory touch and sharp competition—have spawned enormous wealth. "This economy is powerful, productiv
A. America should ban the import of low-skills workers.
B. imported low-skills workers can affect the poor greatly.
C. the American poor are afraid of high-skills immigrants.
D. new immigrants should struggle to make a living in America.

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[单项选择]许多英语学习者曾经感觉到学习到达一定的层次以后，想要再进一步地提高学习成绩变得非常困难，仿佛学习停滞不前了，即使继续努力也收效不大，这种现象叫（）。
A. 高峰体验
B. 高原现象
C. 练习效应
D. 机体疲劳

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[填空题] Although the Arabian camel, or dromedary, can go without drinking for a long while, its hump(驼峰) does not store water as is commonly believed. The real 【B1】______ of the animal’’s unusual ability to store water 【B2】______ in the fact that very 【B3】______ of the camel’’s water is lost by 【B4】______ through the skin. Instead of 【B5】______ out great quantities of water, the camel’’s body temperature 【B6】______, sometimes as much as eleven degree, to compensate 【B7】______ external heat. When a camel 【B8】______ require water, it replaces only the 【B9】______ lost since its last drink. In Egypt, 【B10】______ November and April, the camel 【B11】______ go for three or four months without drinking if it 【B12】______ in lush(繁茂的) pastures where dew(露水) and 【B13】______ keep the vegetation green. If only 【B14】 ______ feed is available, the camel will get 【B15】______ after several weeks—even during January. The 【B16】______ of time a camel can go without drinking is greatly 【B17】______ by
A. A．elevates
B．downs
C．rises
D．falls

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[单选题]水利水电施工企业安全生产档案包括安全生产过程事件活动和检查等产生的文件和记录。
A.正确
B.错误

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[单选题]工作期间，工作票应始终保留在（）手中。
A.工作票签发人
B.工作负责人
C.工作许可人
D.专责监护人

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[不定项选择]精益思想最初在（）领域得到应用
A. 食品
B. 服装
C. 电脑
D. 家电
E. 汽车

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[简答题](899528)气相法聚乙烯装置乙烯精制系统脱除杂质共有哪些?请依次写出这些杂质组分。(1.0分)

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[多选题]车站按技术作业分为（）。
A.编组站
B.区段站
C.客运站
D.中间站

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[判断题]（判断题）下图为某钢箱梁夜间吊装现场，存在的主要安全隐患为夜间照明不到位和吊装警戒区未设置。（）
A.正确
B.错误