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问题 填空题

甲、乙、丙、丁四人进行射击测试，每人10次射击成绩的平均数都是9.2环，方差分别为s甲2=0.56，s乙2=0.60，s丙2=0.50，s丁2=0.45，则成绩最稳定的是______．

答案

因为s甲2=0.56，s乙2=0.60，s丙2=0.50，s丁2=0.45

所以s丁2＜s丙2＜s甲2＜s乙2，由此可得成绩最稳定的为丁．

故填丁．

单项选择题 A1/A2型题

对医师是"仁者"最准确的理解是（）。

A.医师应该关心和爱护患者

B.医师应该是伦理学家

C.医师应该正确处理好与患者的关系

D.医师应该具有高尚的道德

E.医师应该精通儒家学说
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单项选择题

The blue of the sea is caused by the scattering of sunlight by tiny particles suspended in the water. Blue light, being of short wavelength, is scattered more efficiently than light of longer wavelengths. Although waters of the open ocean are commonly some shade of blue, green water is commonly seen near coasts, especially in tropical or subtropical regions. This is caused by yellow pigments being mixed with blue water. Phytoplankton are one source of the yellow pigment. Other microscopic plants may color the water brown or brownish-red. Near the shore, silt or sediment in suspension can give water a brownish hue. Outflow of large rivers can often be observed many miles offshore by the coloration of suspended soil particles.Marine phytoplankton (Greek for "plant wanderers") are microscopic single-celled plants that include diatoms, dinoflagellates, coccolithophorids, green algae, and blue-green algae, among others. The growth of these organisms, which photosynthesize light, depends on a delicate balance of nutrient enrichment via vertical mixing, which is often limited by the availability of nitrogen and light. Diatoms are one-celled plants with patterned glass coverings. Each glass, or silicon dioxide box, is ornamented with species-specific designs, pits, and perforations making them popular with microscopists and, more recently, electron scanning microscopists.

Phytoplankton are the source of which color pigment

A．Red.

B．Green.

C．Yellow.

D．Blue.
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