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问题 单项选择题

正常月经周期中雌激素出现第二次高峰的直接原因是（）。

A.雌激素的正反馈作用

B.孕激素的正反馈作用

C.催乳素的作用

D.黄体生成素的作用

E.促卵泡激素的作用

答案

参考答案：D

多项选择题

病历摘要：患者男性，70岁。有吸烟史近40余年，近5年来时有气喘，呼多吸少，动则更甚，咳嗽，胸闷，形体消瘦，肢冷，曾多次住院治疗。1天前受凉后症状复发，今日晚上病情突然加重，气喘，张口抬肩，鼻翼煽动，端坐不能平卧，稍动则喘剧欲绝，心悸，烦躁，面青唇紫，汗出如珠，下肢浮肿，舌质淡而无华，少苔，脉浮大无根。 该病人此时的治法应为哪几种？（）

A.益肺补肾，纳气定喘

B.扶阳固脱，镇摄肾气

C.补气益阴，敛汗固脱

D.温阳利水，泻壅平喘

E.滋阴纳气，佐以活血
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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.

Green water near coastlines is almost always caused by________.

A．sand color

B．red pigments in coastal waters

C．blue pigment

D．reflected light and yellow pigment from plant life
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