题干

下列有关生物群落演替的叙述错误的是(    )

A:火灾后的草原,过量砍伐的森林、冰川泥地上进行的演替都属于次生演替

B:演替过程中由草本植物阶段渐变为灌木阶段,主要原因是灌木较为高大,能获得更多阳光

C:在生物群落发展变化过程中,一个群落被另一个群落代替的过程,就是群落的演替

D:群落演替的根本原因是群落内部因素的变化。

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A

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    A girl complained to her father about her hard life. She didn't know what she had to do and wanted to1up. She felt tired of fighting and fighting. One problem had been finished but2came over.

    Her father, a cook, took her into the3.He poured water into three pans (锅) and boiled it. When the water was boiling, in the first pan he put some carrots, in the second he put some eggs and in the last he put some coffee. He 4for them for a few minutes without any words.

    The girl waited impatiently, not knowing5her father was doing that. About 20 minutes later, her father turned6the stove, took out the carrots and put them in a bowl. He took out the7and put them in another bowl. After that the coffee was poured into a cup. Turning back to his daughter, he asked, “My sweet heart, what do you8?” “Carrots, eggs and coffee,” she answered.

    Her father told her to 9her eyes and let her touch the carrots. She did so and felt that the carrots were10. After that he asked her to take eggs and11them. Then, she got the eggs, warm and hard. At last, the father asked her to smell the coffee. She asked, “What did you do this for, Father?” He12that each one had had the same unlucky experience—the boiling water, but13had a different result. The strong and hard carrots had become soft and weak after being in the boiling water. The eggs became hard after being cooked. The coffee was very14and it changed the water. “Who are you?” asked her father, “When bad luck15your door, what's your decision? Are you carrots, eggs or coffee?”