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上市公司进行重大资产重组，应当由（）依法作出决议。

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核不育材料可以实现“三系”配套。

大麦的淡绿色叶片可由细胞质因子(L₁=正常绿叶，L₂=淡绿叶)引起，也可由隐性核基因(υυ=淡绿色叶)引起。请预测下列组合中子代的基因型和表型：

质-核型雄性不育系的基因型是，保持系的基因型是，恢复系的基因型是或。

As you know, 'being green" means that you care about the environment(环境) and that you do what you can to help the Earth. Recycling(回收利用)paper and cans, reducing waste, and pro-tecting wildlife are all examples of "green" activities.
This special green issue of National Geographic Kids is devoted to the environment. In fact, you' re being green simply by reading it. When you' re finished, you ' ll know a lot of things you probably did
n ' t know at all. And you ' ll be a greener citizen with a strong sense of environmental protection.
In this issue(一期杂志) you will discover how you can help the Earth face its five biggest en-vironmental problems. Animal behavior. specialist Jane Good all shares new ideas about how you can help wildlife. Answer actor Leonardo DiCaprio ' s call to action to help the environment. Just how green are you？ Answer our questions on page 10 to find out. You may win a trip to Orlando, Flori-da. And there ' s a special pullout poster to hang on the wall.
61. The writer' s main purpose in writing this text is to_______.
[ A] persuade the reader to waste less
[ B ] explain the meaning of the word " green"
[ C] encourage people to buy this issue
[ D] call on people to protect the environment