下列组合中，依次属于种群、群落、生态系统的一组是（）①一块稻

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问题单项选择题

下列组合中，依次属于种群、群落、生态系统的一组是（）①一块稻田中所有三化螟幼虫、蛹和成虫②某一池塘的全部生物③亚马孙丛林的全部生物及无机环境④长白山上的全部动物及绿色植物

A.①②③

B.②③④

C.③④①

D.①②④

答案

参考答案：A

填空题

根据句意和汉语注释，写出单词的正确形式。

1. There are _________ (各种各样的) designs of shoes for shoppers to choose from.

2. The________(工程师) are famous for their knowledge of computers.

3. As soon as they heard the warning, people rushed out into the street _________(立即)

4. With the help of all her teachers, Millie has made much more ________(进步) this term.

5. The question is still under ________(讨论). We'll tell you the result as soon as possible.

填空题

“宇宙蛋”的模型是谁提出的？（）