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[单选题]
下列有关自然种群的不规则波动说法正确的是( )
A
周期性的或少见的数量波动
B
周期性的或常见的数量波动
C
非周期性的或少见的数量波动
D
非周期性的或常见的数量波动
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试题答案：
C
答案解释：
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某森林现存量为324 t／hm2，年净生产量为28.6 t／hm2，则其更新率为0.088，全部现存量更新一次约需要__________年。
生物对不同生态因子的耐受性不同，并且耐受性可以人为改变。 ( )
植物根系深入土壤，利于一部分微生物和穴居动物进入土壤的深层。 ( )
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氧气对水生动物来说，属于（ ）
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在脊椎动物中，__________的光周期最为明显。
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在课程创生取向的视野中，教学设计的主体是（ ）
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社会形态是（ ）
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17．人们把成功与失败归于何种因素，对以后的工作态度和积极性有很大影响。这反映了下列哪种理论的观点?
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There were once many sheiks（阿拉伯的酋长）who wanted to marry Queen Maura, for she was one of the most beautiful powerful queens of Arabia.However, she did not like most of the sheiks, soon there were only three left on her list of possible husbands.These three sheiks were all equally young handsome, rich strong.It was very hard for the Queen to choose the best one.One evening, she disguised herself went to where the three sheiks were having their evening meal.She asked them to give her something to eat.The first sheik gave her some stale（不新鲜的）food left over from the day before.The second sheik gave her a tough piece of old camel's tail.The third sheik, whose name was Hakim, gave her some of the most tender（嫩的）tasty meat.After the meal, Queen Maura left the sheiks' camp.The next day, she invited the three sheiks to dinner at her palace.She told her servants to give each sheik what he had given her the evening before.Hakim, who received a plate of tender tasty meat, would not eat it unless the other two sheiks could share it with him.Queen Maura was now certain which of the sheiks she wanted to marry."Hakim is the most generous of you," she told them, "so I want to marry him he will become king."The queen was looking for a husband.A、TB、F
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