题目内容

“东胡林人”遗址是新石器时代早期的人类文化遗址,在遗址中发现的人骨化石经鉴定属两个成年男性个体和一个少年女性个体。在少年遗骸的颈部位置有用小螺壳串制而成的项链,腕部佩戴有牛筋骨制成的骨镯。这说明在新石器时代早期,人类的审美意识已开始萌动。 以下哪项如果为真,最能削弱上述论证的结论

A. 新石器时代的饰品通常是石器。
B. 出土的项链和骨镯都十分粗糙。
C. 项链和骨镯的作用主要是表示社会地位。
D. 两个成年男性遗骸的颈部有更大的项链。
E. 只有现代的人类才能说有了真正的审美意识。

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多项式x4+mx2-px+2能被x2+3x+2整除. (1)m=-6,p=3. (2)m=3,p=-6.

A. 条件(1)充分,但条件(2)不充分.
B. 条件(2)充分,但条件(1)不充分.
C. 条件(1)和条件(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D. 条件(1)充分,条件(2)也充分.
E. 条件(1)和冬件(2)单独都不充分.条件(1)和条件(2)联合起来也不充分.

2008年以来,索马里附近海域先后发生累计逾120起的海盗劫船事件。海盗为何如此猖獗甲、乙、丙、丁四人有如下断定: 甲:海盗猖獗的主因是被劫船只的船主通常都愿支付高额赎金。 乙:如果海盗猖獗的主因是被劫船主愿支付高额赎金,那么肯定会助长海盗的气焰。 丙:确实助长了海盗的气焰,但其主因并非被劫船主都愿支付高额赎金。 丁:海盗猖獗主要是被劫船主愿支付高额赎金,但其嚣张气焰并非都由此生成。 上述如果只有一个人的断定是真的,那么以下断定都不可能真,除了:

A. .甲。
B. .乙。
C. .丙。
D. .丁。
E. 不能确定。

数列6,a,b,16,前3项成等差数列,后3项成等比数列. (1)4a+b=0. (2)a,b是x2+3x-4=0的两个根.

A. 条件(1)充分,但条件(2)不充分.
B. 条件(2)充分,但条件(1)不充分.
C. 条件(1)和条件(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D. 条件(1)充分,条件(2)也充分.
E. 条件(1)和冬件(2)单独都不充分.条件(1)和条件(2)联合起来也不充分.

The molecules of carbon dioxide in the Earth"s atmosphere affect the heat balance of the Earth by acting as a one-way screen. (1)_____ these molecules allow radiation at visible wavelengths, where most of the energy of sunlight is concerned, to pass (2)_____, they absorb some of the longer-wave-length, infrared emissions radiated from the Earth"s surface, radiation that would (3)_____ be transmitted back into space. For the Earth to maintain a constant average temperature, such emissions from the planet must (4)_____ incoming solar radiation. If there were no carbon dioxide in the atmosphere, heat would (5)_____ from the Earth much more easily. Today, (6)_____, the potential problem is too much carbon dioxide. Could the increase in carbon dioxide (7)_____ a global rise in average temperature, and could such a rise have serious (8)_____ for human society Mathematical models that allow us to calculate the rise in temperature as a function of the increase (9)_____; that the (10)_____ is probably yes. One mathematical model (11)_____ that doubling the atmospheric carbon dioxide would raise the global mean surface temperature by 2.5℃. This model assumes that the atmosphere"s relative humidity remains constant and the temperature decreases with altitude at a (12)_____ of 6.5℃ per kilometer. The assumption of constant relative humidity is important, because water vapor in the atmosphere is another (13)_____ absorber or radiation at infrared wavelengths. Because warm air can hold more (14)_____ than cool air, the relative humidity will be constant (15)_____ the amount of water vapor in the atmosphere increases (16)_____ the temperature rises. (17)_____, more infrared radiation would be absorbed and reradiated (18)_____ to the Earth"s surface. The resultant warming at the surface could be expected to melt snow and ice, (19)_____ the Earth"s reflectivity. More solar radiation would be absorbed, (20)_____ to a further increase in temperature.

A. if only
B. as if
C. only if
D. even if

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