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【简答题】
下图为两个种间植物细胞融合和再生植株示意图。请据图回答(一～八表示各主要步骤)： (1)从步骤一到步骤二是植物细胞形成_____的阶段，其关键技术是_____。 (2)从步骤二到步骤三一般要用______作为促融剂。 (3)步骤四为_____过程。 (4)在形成再生植株的过程中，与植物组织培养有相似之处的步骤是_____，理由是_____。 (5)步骤八表示选择体细胞杂种植株，杂种植株在形态上表现为_______，其根本原因是______。
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【单选题】Ellen 查看材料
A.
All animals have the right to live for themselves.
B.
Some vegetarians in fact eat small-sized animals.
C.
Vegetarians need to do more to save animals'lives.
D.
Some people have overstressed the rights of animals.
E.
Vegetarians should be consistent in their eating habits.
F.
How can I become a vegetarian without a favorable environment?
G.
Eating less meat saves not only the life of animals but also that of your own.
【单选题】下列有关累退税率的表述中错误的是()。
A.
课税对象数量越大，税率越高;课税对象数量越小，税率越低，是累退税率的显著特点
B.
考虑到要素收入的边际成本递增资本边际效率递减，特别是边际净效率递减，在所得税领域实行累退税更加有利于资本等要素的供给
C.
对那些资源稀缺的社会，实行累退制税率对于提高资源的利用效率鼓励技术进步具有重要作用
D.
对日用必需品征收的消费税，对于收入水平高低悬殊的消费者而言，就是一种实际累退税率
【判断题】u QUESTIONS Read the statements. Then listen to the news and decide whether the statements are true (T) or false (F). 1 . The coronaviruses typically cause respiratory symptoms. 2 . We should wash our...
A.
正确
B.
错误
【简答题】根据QQ群里发的视频 补充下列词汇 首字母已给出作为提示 答题时把首字母一并填上 How to talk about food We can use some general words like delicious, tasty or great to describe something you like. From the video, we learn some different ex...
【简答题】单词分类。 请根据所给句子的意思，从下面方框中选出适当的词，并将其字母标号填在相应的位置。 小题1:It’s the first exam for Tom after he went to the college. He did ____/___ in it. 小题2:Be careful when you ____/_____across the road. 小题3:The shirt feel...
【判断题】Passage 3 Vocabulary edible /'edɪbl/ a. suitable or safe to eat Listen and decide whether each statement below is true (T) or false (F). Your decision should be based on what you hear from the lecture...
A.
正确
B.
错误
【简答题】轮藻的有性生殖方式为(), 其雌雄生殖器官分别称为()和()。
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