题目内容

细胞周期中的引擎是_和____。

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The Internet The Internet is a global (globe) system of computer networks to serve billions of users worldwide. The Internet has reshaped most___（41）(tradition) means of communication including telephone , music , film and television. This has given birth to new_（42）(develop) of mass media. Newspaper, book and other print publishing are_（43）(adapt) themselves to this new technology. The Internet has_（44）(enable) new forms of human communications such as online chatting and social networking. online shopping has_（45）(grow) rapidly for major stores and small traders. The business-to-business service on the Internet affects the supply chains across all_（46）(industry). The origins of the Internet date back to research in the 1960s. The project was to build_（47）(power) computer networks. It was supported by the US_（48）(govern ) in cooperation with private businesses. By the 1990s, the Internet was made a commercial _（49）(produce)and became popular worldwide. As of 2011, _（50）(near)a third of the Earth's population used the Internet. _.
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请帮忙给出每个问题的正确答案和分析，谢谢！

How Old Are You？ In English, when we meet people for the first time, there are some safe topics to talk about, such as weather, or which part of the country they come from. We wouldn't ask them whether they were___（31）,or how much they earned, or how_（32）they were． We learn these politeness rules very_（33）on in life, from around age three. “How old are you？” asks Auntie Ann at little Jimmy's fourth birthday party. "I'm four",_（34）Jimmy. And then he says, "How old are you？" But Auntie Ann won't say. And_（35）,Jimmy learns that one thing you should never_（36）is ask a lady her_（37）! This is one of the rules of polite_（38）which is found in cultures and languages in many parts of the_（39）,but not everywhere． In some Asian cultures questions about age are very_（40）It's just their way of being friendly. _. A．conversation B．age C．married D．says E．common F．generally G．early H．asks I．gradually J．do K．old L．world
_. A．conversation B．age C．married D．says E．common F．generally G．early H．asks I．gradually J．do K．old L．world
_. A．conversation B．age C．married D．says E．common F．generally G．early H．asks I．gradually J．do K．old L．world
_. A．conversation B．age C．married D．says E．common F．generally G．early H．asks I．gradually J．do K．old L．world
_. A．conversation B．age C．married D．says E．common F．generally G．early H．asks I．gradually J．do K．old L．world
_. A．conversation B．age C．married D．says E．common F．generally G．early H．asks I．gradually J．do K．old L．world
_. A．conversation B．age C．married D．says E．common F．generally G．early H．asks I．gradually J．do K．old L．world
_. A．conversation B．age C．married D．says E．common F．generally G．early H．asks I．gradually J．do K．old L．world
_. A．conversation B．age C．married D．says E．common F．generally G．early H．asks I．gradually J．do K．old L．world
___. A．conversation B．age C．married D．says E．common F．generally G．early H．asks I．gradually J．do K．old L．world
请帮忙给出每个问题的正确答案和分析，谢谢！

简述细胞周期各时相的主要事件及其核心调控机制。

试比较染色体着丝粒与着丝点的区别与联系。