水是生命之源。欧盟建议9~13岁的孩子,每天喝水1.68升;14~18岁少年,每

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问题:

水是生命之源。欧盟建议9~13岁的孩子,每天喝水1.68升;14~18岁少年,每天饮水量要达到2升。以下有关叙述错误的是

A.人体内的水分通过泌尿、排汗两条途径排出体外

B.天气炎热时或剧烈运动后,需要及时补充淡盐水

C.人体产生的代谢废物,需要溶解在水中才能排出体外

D.水参与人体的物质运输、体温调节等重要生理活动

考点:尿的形成和排出泌尿系统的组成和功能排泄和排遗
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增加牙支持式可摘义齿固位力的方法有 ()

A.减小人工牙颊舌径

B.适当降低咬合

C.增加卡环的数目

D.调整基牙间的分散程度

E.调整就位道

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If 1999 was the year of e-commerce—and it was, oh, it was!—then the guy who built Amazon. com must be the year’ s (36) mover. Fearless multibillionaire (亿万富翁) leader of the Web’s biggest store, Bezos (37) a company that adds customers so fast that it doesn’t have time to make money. In the process, he has made life (38) for anyone else trying to sell goods online. Amazon has spent the past year using its (39) customer base—and its one-click ordering system, Amway-like network and here-every-one-knows-your-name customer service—to (40) Microsoft-like into nearly everyone else’s business. Music and video competitors CDNow and N2k had to combine to fight off Amazon’s (41) . A summer move into toys and (42) helps explain why the (43) company has been building a network of 75,000-sq-m warehouses across the country. (44) . Where Bezos doesn’t build, he buys. (45) . Once a Wall Street man who cooled up financial models for D. E. Shaw, Bezos set off for Seattle in 1994, writing the business plan for Amazon.com on the plane. (46) .

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空气进入肺的正确顺序是

①鼻腔 ②支气管 ③喉 ④肺泡 ⑤气管[ ]

A.①→②→③→④→⑤

B.①→③→②→⑤→④

C.①→③→⑤→②→④

D.①→⑤→③→②→④

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根据《民用航空电信人员执照管理办法》,执照理论考试合格证应加盖()电信人员执照管理部门印章。

A.民航地区空管局

B.民航地区管理局

C.各地方机场

D.监管局

题型:选择题

玉米非糯性基因(W)对糯性基因(w)是显性,黄胚乳基因(Y)对白胚乳基因(y)是显性,这两对等位基因分别位于第9号和第6号染色体上。W—和w一表示该基因所在染色体发生部分缺失(缺失区段不包括W和w基因),缺失不影响减数分裂过程。染色体缺失的花粉不育,而染色体缺失的雌配子可育。请回答下列问题:

以wwYY和WWyy为亲本杂交得到F1,F1自交产生F2。选取F2中的非糯性白胚乳植株,植株间相互传粉,则后代的表现型及其比例为()。

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