Climate change has caused a rise in sea levels. This has increased the amount of salt in fresh water____(use) on coastal farms. As____ result, farmers are ____(gradual) unable to use fields close to the sea.

    However, Marc Van Rijsselberg, a farmer in the Netherlands is now using a____(mix) of sea and fresh water ____(grow) healthy and tasty vegetables.

    He teamed up with scientists from the Free University and divided a farm ____eight negated areas. Separate pipes pumped fresh and sea water, and a computer program created water with eight levels of salinity（含盐度）．

    The water levels and the levels of salinity were controlled by computerized measuring devices called "sensors". Mr. Van Rijsselberg said he was able to harvest vegetables from most of the eight testing areas. He said the vegetables were smaller than ____grown in fresh water. But he said they also had more sugar and salt, so they tasted much____(good).

    He found that potatoes grew better than the other vegetables in the combination of sea and fresh water. Mr. Van Rijsselberg said four kinds of these potatoes would be sent to Pakistan____thousands of hectares of land ____(damage) by salinization (盐化作用) last year.

工人用如图甲所示的滑轮组运送建材上楼，每次运送量不定。滑轮组的机械效率随建材重力变化的图像如图乙所示，滑轮和钢绳的摩擦力及绳重忽略不计，g取10N／kg。

开普敦是南非的主要港口和第二大城市。建于1652年，原为欧洲殖民者向亚洲扩张时期重要的供应站，迅速发展成为南非第二大城市，现有多条铁路、公路线通往内陆地区及其他国家。图13为开普敦城区及交通分布示意图。据此回答下列问题。