问题 综合

读下面两国轮廓图,回答有关问题:

(1)图A国的首都是______,东部最大的工业城市是______。图B国的首都是______,东南部最大的工业城市是______。

(2)图A国的主要经济作物______、______、______等,与图B国相同的矿产主要有______、______;图B国的主要经济作物有______、______,该国的矿产主要分布在______部。

(3)图A中的河流是______,该国主要的气候类型是______;图B中的河流是______,该河流量大的原因是_______________________。

答案

(1)新德里;加尔各答;巴西利亚;圣保罗

(2)黄麻;棉花;茶叶;铁矿;锰矿;咖啡;可可;甘蔗;东南

(3)恒河;热带季风气候;亚马孙河;流域面积大、降水丰沛、支流多

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.

The growth of phytoplankton is often limited by the availability of________.

A.oxygen

B.hydrogen

C.nitrogen

D.carbon dioxide

单项选择题