问题 单项选择题

据报道,某国科学家在一块60万年前来到地球的火星陨石上发现了有机生物的痕迹,因为该陨石由二氧化碳化合物构成,该化合物产生于甲烷,而甲烷可以是微生物受到高压和高温作用时产生的。由此可以推断火星上曾经有过生物,甚至可能有过象人一样的高级生物。以下条件除了哪项外,都对上文的结论提出质疑

A.火星陨石在地球上的60万年间可能产生了很多的化学变化,要界定其中哪些物质仍完全保留着在火星上的性质不是那么容易的。

B. 60万年的时间与宇宙的年龄相比是微不足道的,但在这一期间的生物进化的历史可以是丰富多彩的。

C.微生物受到高压和高温作用时可以产生甲烷,但甲烷是否可以由其他方法产生是有待探讨的一个问题。

D.由微生物进化到人类需要足够的时间和合适的条件,其复杂性及其中的一些偶然性可能是现在的人们难以想象的。

答案

参考答案:C

解析:只有C项对题干的结论提出了质疑.

单项选择题
阅读理解

阅读下面的短文,请根据文后的要求答题(请注意问题后的词数要求)

[1] Teens need independence, but how do you make sure they are safe? It’s tough to decide when to give your teen more freedom. One parent’s decision for his or her teen may not be right for other parents and their teens. Although every child is different, there are many experiences common to the teenage years. The most common may be the pull and push between dependence and independence.

[2] Many teens are putting themselves at risk for committing(从事) acts of violence and other crimes. No wonder so many parents are concerned, even frightened; no wonder so many try to control the behavior of their teenage children. So, it is important for parents to make rules for their young children.

[3] However, as children get older, they need to learn to make some of their own decisions and life choices. Teens need the chance to practice good decision-making skills, and to manage new life experiences. Parents need to try their best to support their children.

[4] Respect is a two-way street but it starts with you, which means that you should give your teens the respect that you would like to be given. Give them praise for their knowledge and abilities; pay attention to and listen to them. That means showing confidence in your teens, and being supportive. Parents should believe in your teens; set high standards for them, encourage them, expect them to achieve their goals, and provide consistent(一贯的;始终如一的)love and support —including practical help—so they can achieve the promise that lies within them.

[5] Teens are learning to take care of themselves as they prepare for adulthood. That’s what growing up is all about. Give them and appropriate(适当的) amount of freedom and independence. Encourage and promote responsibility and good decision—offering support and gentle help with difficult decisions. Let your teens know they will be given _________________ as they show increasingly responsible behavior.

小题1:Who is this passage most probably written for? (no more than 5 words)

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小题2:What’s the common experience of the teenagers? (no more than 10 words)

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小题3:Why should parents attempt to make rules for their children?

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小题4:Fill in the blank in Paragraph 5 with proper words (no more than 5 words)

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小题5:What are the fourth and fifth paragraphs mainly about? (no more than 10 words)

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