下列叙述符合达尔文自然选择学说的是

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下列叙述符合达尔文自然选择学说的是（）

A：野兔的保护色和鹰锐利的视觉是它们相互选择的结果

B：伦敦桦尺蠖黑化现象是煤烟熏黑的结果

C：青霉素的效果越来越差是病原体对青霉素选择的结果

D：长颈鹿经常努力伸长颈和前肢去吃高处的树叶，因而颈和前肢都很长

上一题下一题 0.0难度选择题更新时间:2016-12-02 06:28:33

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A

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C

There are many festivals at our school. This month is October. In October there is a sports festival. We have the volleyball game and the basketball game during(在……期间) the festival. On October 15th，there is an English festival. On that day we have an English speech contest(演讲比赛)．On October 19th，we have a school trip. We go to Beijing with the teachers. On the last day of this month，there is a music festival. On that day we can enjoy beautiful music. It's really wonderful. Next month，there is an art festival. Students often display(展示) their pictures on that day.

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