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[单选题]
高原植物叶肉组织具有丰富的含较多单宁或胶状物质的异细胞，其作用是 ( )
A
形成CO2的储库
B
增加抗寒、抗旱能力
C
有利于增加光的吸收量
D
吸收高原增多的紫外辐射
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试题答案：
D
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最有利于植物生长的pH是__________。
植物的密度效应指的是（ ）
生态系统的组成和结构越复杂，其稳定性越强。( )
演替与波动是有区别的。演替是一个群落代替另一个群落的过程，是朝着一个方向连续的变化过程；而波动是短期的__________的变化。
群落之间、群落与环境之间相互关系的可见标志是 ( )
下列生态因子中，对生物起间接作用的是( )
下列土壤分类中，属于隐地带性土壤的是（ ）
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Passage 1 In April, the EC imposed a ban on livestock, meat dairy products from 18 eastern countries following an outbreak of hoof mouth disease in Croatia. Hungarian Foreign Minister Geza Jeszenszky told EC leaders that the “entirely unwarranted (move) smacks of a most regrettable survival of the notion of an Eastern bloc.” The EC followed with antidumping duties “voluntary” export restraints on certain steel products from Hungary Poland. just days after signing the EFTA free trade agreement in early April, Austria introduced import quotas on chemicals, cement agricultural machinery, steel from Eastern Europe. West Europeans claim that their eastern neighbors have an unfair advantage because of low wages, state subsidies low environmental standards. Although the EC EFTA agreements are supposed to lift tariffs trade barriers on most industrial goods over 10 years, most agricultural products are not included in the agreements. This is critical for Hungary, with its extensive farm sector. “The EC is never going to let Hungary achieve its potential output,” says Iowa David Andres, who has studied Hungarian agriculture firsth,” They’re already afraid of Hungary.”Statements: 42. “In April, the EC imposed a ban on livestock, meat, dairy products from 18 eastern countries following an outbreak of hoof mouth, disease in Croatia.” Here imposed a ban means shut out imports. ( ) 43. With the EC EFTA agreements, there will hardly be any improvement in exports of Eastern Europe’s agricultural products. ( )44.The EC EFTA agreements will let Hungary achieve its agricultural potential output. 45.There will be a lot of improvement in exports of Eastern Europe’s products except agricultural products. ( ) 46.The EC EFTA agreements are supposed to lift tariffs trade barriers on all the products over 10 years. ( )
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