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[单选题]
下列有关水生植物特点正确的是( ) ①发达的通气系统 ②叶片极厚 ③植物体具有较强的弹性 ④淡水植物具有自动调节渗透压的能力
A
①发达的通气系统 ②叶片极厚 ③植物体具有较强的弹性 ④淡水植物具有自动调节渗透压的能力A.①②③
B
②③④
C
①③④
D
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试题答案:
C
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在大气上空的__________能吸收过滤掉紫外线辐射中最强的波段,保护地面生物免受紫外线伤害。
在山区,方向有昼夜转换现象的地方性风叫做山 。
在温暖季节里,有一种风带来热而干燥的空气,受这种风的影响后,植物体内的水分平衡受破坏。这种风称为__________。
生态学巩固时期,生态学发展达到第一个高峰,主要是指 ( )
农业生态系统是一种耗散结构。 ( )
随着生态演替的发展,生物小循环加强。( )
群落内部环境因子的__________,是群落镶嵌性的主要原因。
广义的共生包括原始合作、偏利共生和__________。
简述生态系统区别于一般系统的特点。
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1.
Coconut(椰子)is an unusual food for many reasons.It is one of the largest edible seeds produced by any plant.Its unusual contents also make it unique in the seed world—it consists of both “meat“ and “water” inside.The coconut meat is the white substance with which we are all familiar,as it is used extensively for cooking and flavorings;the coconut water is a white and sweet liquid.Portuguese(葡萄牙的) explorers gave the nut its name in the l5th century, referring to it as coco,meaning “ghost” in their language.The outside appearance of coconuts reminded them of a ghost’s face,and the tree has had that name ever since. The coconut has varied uses.It is used to make various cooking oils for fast food restaurants around the world to make diet materials.The coconut fluid is a favorite drink in hot climates,providing a cool and refreshing beverage right off the tree.This water is also used by manufacturers of various sports drinks.Even the shell itself has many uses,including animal food and fertilizer. And all these are only some of the uses found for the coconut fruit.The coconut tree, which produces the nut,also produces many useful things.It’s no wonder that the coconut tree has been taken as “the tree of life”.
2.
清政府在今新疆地区实行的特殊行政管理制度是( )
3.
I dont regret ______ her what I thought of her friend, even though it might have upset her.
4.
货币市场的特点不包括( )
5.
根据对日照长度的反应型可把植物分为长日照植物、日中性植物和__________。
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