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东北东部山地的阔叶红松林受破坏之后，形成一片空地，叫做“林窗”，这时候往往最先进入的是杨树、白桦等。但随着时间的推移，周围的红松林会慢慢在这片区域生长繁殖并逐渐替代杨树和白桦重新成为林地中的优势种。下列有关说法正确的是

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A．杨树、白桦在受破坏的空地上生长繁殖引起的群落演替属于初生演替

B．红松林重新取代杨树和白桦的结果说明红松林在竞争中处于优势

C．在群落演替的初期，不存在种群间的竞争关系

D．在群落演替的过程中，群落的物种组成不会发生变化

答案

答案：B

阅读理解

阅读理解。

Dear Sonia,

     I am having a party for my 13th birthday. Can you come to my birthday party? It will be a wonderful

party. You can listen to some pop music and you can see a big birthday cake. I think it's much bigger than

your backpack. It is as big as a desk. Did you see such a cake? It will be a special party, too. It's also a ball.

You can dance to the nice music. But you have to take a partner (伙伴；搭档). The party begins at 7:00 pm

on Friday. Welcome to my house. You will enjoy yourself! Don't forget to take a boy!

                                                                                                                                   Yours,

                                                                                                                                    Lily

1. This is an invitation _______.

A. to a boy

B. From Sonia

C. to Sonia

D. to Lily

2. There is a very _______ at the party.

A. big backpack

B. small desk

C. big cake

D. big desk

3. The underlined (画线的) word "ball" means _______.

A. basketball

B. soccer ball

C. dancing party

D. match

4. The party will be held (举行) _______.

A. in the evening

B. next Friday

C. on the weekends

D. in the morning

5. If Bob goes to the party, he may need to take a _______ with him.

A. boy

B. girl

C. ball

D. dog

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选择题

近年来，潮州市委、市政府为把城市建设成清新秀丽、充满灵气和活力的岭南名城，充分开发旅游资源，吸引外资，大力实施以“显山、露水、透绿、现蓝”为目标的城市发展战略。这一战略  [      ]

①体现保护环境的基本国策 ②体现了科学发展观的要求 ③解决了社会的主要矛盾 ④符合了可持续发展的要求

A．②③④

B．①②③

C．①④

D．①②④
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