【名词&注释】
根尖细胞有丝分裂(mitotic root tip cells)、单子叶植物(monocotyledon)、双子叶植物(dicotyledon)、碘化钾溶液(ki solution)、内皮层(endodermis)
[单选题]双子叶植物根的内皮层(endodermis)的径向壁、横向壁和内切向壁发生木质化和栓质化的增厚，具有通道细胞。( )
A. 正确
B. 错误
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举一反三：
[单选题]洋葱根尖细胞有丝分裂观察实验中用的染料是( )。
A. 碘-碘化钾溶液
B. 中性红溶液
C. 固绿染液
D. 醋酸洋红染液
[单选题]听第7段材料，回答第8、9题。
8 Where has Barbara been?
A. Milan
B. Florence
C. Rome
[单选题]______ the project in time, the staff were working at weekends.
A. Competing B．Having completed
B. To have completed
C. To complete
[单选题]It is not immediately clear _______ the financial crisis will soon be over.
A. since
B. what
C. when
D. whether
[单选题]根据内容，回答下面问题：We have met the enemy, and he is ours. We bought him at a pet shop. When monkey-pox, a disease usually found in the African rain forest, suddenly turns up in children in the American Midwest, it’s hard not to wonder if the disease that comes from foreign animals is homing in on human beings.“Most of the infections(感染)we think of as human infections started in other animals.”says Stephen Morse, director of the Center for Public Health Preparedness at Columbia University.It’s not just that we’re going to where the animals are; we’re also bringing them closer to us. Popular foreign pets have brought a whole new disease to this country. A strange illness killed Isaksen’s pets, and she now thinks that keeping foreign pets is a bad idea.“I don’t think it’s fair to have them as pets when we have such a limited knowledge of them,”says Isaksen.
A. “Laws allowing these animals to be brought in from deep forest areas without stricter control need changing,”says Peter Schantz. Monkey-pox may be the wake-up call. Researchers believe infected animals may infect their owners. We know very little about these new diseases. A new bug(病毒)may be kind at first. But some strains(变异体)may become harmful. Monkey-pox doesn’t look a major infectious disease. But it is not impossible to pass the disease from person to person.
B. 第9题：We learn from Paragraph I that the pet sold at the shop may____ .
C. come from Columbia
D. enjoy being with children
E. prevent us from being infected
F. suffer from monkey-pox
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