试题与答案

Cause and effect is one way to explain t

题型:阅读理解

题目:

Cause and effect is one way to explain things that happen around us. Many things happen because something caused or influenced them to happen. Sometimes it is hard to look at a cause and find out what causes the effect. It may help you to start with the effect and use your reasoning(推理的) skills. Think about all the things you know that could be reasons for the effect you can see.

For example, you may see someone putting on a heavy jacket. This is the effect. To look for a cause, think to yourself, “What would make someone put on a heavy jacket?” Maybe the person works in the penguin pen(企鹅圈养地) at a Sea World. Maybe the person is going to visit an ice skating rink where the air is kept very cold. All of these things could be a cause for putting on a heavy jacket.

Now, think about a second example. The effect is a boy named Abi has to go to the head teacher’s office. What are the possible causes? Maybe he bullied(欺负)another student. Maybe he is just being picked up early. Maybe he is being given a prize!

Here is another example for you to think about its cause and effect. Cait, 13, was trying to fall asleep when her 8-year-old brother,Doug, came into her room. He looked around a bit, but seemed really out of it. Then Doug went back into the hallway and stood there looking straight up at the hall light for quite a while. Little brothers can be very strange, this was really much too strange. Cait didn’t know what to do. Just then, Cait’s father appeared and explained that Doug was sleepwalking. What’s the cause and effect, could you tell?

小题1:According to the second paragraph, which of the following is an effect?

A.Someone will go outside into cold weather.

B.Someone works in the penguin pen.

C.Someone puts on a heavy jacket.

D.Someone will go to visit an ice skating rink.小题2:Abi has to go to the head teacher’s office. Which of the following isn’t the possible  cause?

A.He bullied another student.

B.He is going shopping.

C.He is being picked up early.

D.He is being given a prize.小题3: What was Doug doing when his sister Cait tried to fall asleep?

A.He was going outside

B.He was reading a story.

C.He was leep walking.

D.He was looking for his dad.小题4:Which of the following is cause and effect?

A.Tony got up and had a glass of water.

B.We came home and found him sleeping.

C.The ball was lost and a window was broken.

D.Tim was late again and his teacher got angry.小题5:What is the best title for the text?

A.Truth and lies

B.Work and sleep

C.Cause and effect

D.Life and dreams

答案:

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下面是错误答案,用来干扰机器的。

(1)非极性;2;2 (2)原子;SiO2+4HF=SiF4↑+2H2O (3)P>S>Si (4)1s22s22p63s23p63d6(或[Ar]3d6);配位;sp3;三角锥形 (5)1:2

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题型:阅读理解与欣赏

阅读下文,完成文后各题。

太空没有加油站

每次执行航天任务时,太空飞船都必须携带足够的能源以完成各项工作,常见的能源包括化学推进燃料、光电池组和核反应堆。

除此之外,只能采用货运飞船供给方式,但费用昂贵得难以承受。例如要维持国际空间站在未来10年的预期使用寿命期间不致逐渐偏离轨道,就需要大约77吨的推进燃料。将燃料从地面运送到空间站360千米的高度,即使价格低至每磅(约0.45千克)7000美元(按照目前的标准已经非常便宜了),仅仅让空间站维持轨道的稳定也需要12亿美元。对于探索像木星这样的外行星问题则更加复杂,因为它们距太阳太遥远,使光电池的反应效率降低,而且每克燃料都必须运送到数亿千米之外。

因此科学家将目光投向一种还处于实验测试阶段的新技术——航天飞缆。它利用基本物理定律来提供定向、人造重力、电能,以及推进和拖曳力,同时减少或摈弃对化学能源的需求。

航天飞缆是一种采用柔性缆索将两个物体连接起来的系统。当缆索导电时,整个系统便成为一种电动力学缆索,又称EDT。常规飞船采用化学或电能推进装置,在飞船和推进燃料之间交换动量,而EDT则与此方式不同,它通过对磁场的调制与旋转的行星交换动量。长期以来,航天飞缆便令太空爱好者着迷。齐奥尔科夫斯基与Arthur C.Clarke等幻想家曾设想利用缆索系统作为太空电梯,将人们从地面送上轨道空间。60年代中期,双子座飞行任务中有两次测试了利用30米长的缆索为宇航员产生人造重力场,此后又进行了多种类型的缆索试验。主要困难来自机电方面,工程师们尚未开发出可靠技术来处理EDT在太空中承受的高电压。另外,他们也未能解决在恶劣的太空环境下缆索的维系问题,以及如何抑制EDT容易产生的振动。

但是,许多科学家认为该技术能够对某些类型的太空飞行带来革命,其应用范围涉及从低地球轨道飞行到行星航天任务。EDT可能的用途包括:清理地球轨道空间中的残骸,以高于燃料电池的效率发电,以及让卫星保持在合适的轨道上。

小题1:以下对“航天飞缆”的理解,正确的一项是( )

A.飞船在利用EDT和推进燃料之间交换动量基础上,进一步通过对磁场的调制与旋转的行星交换动量。

B.在长距离航天任务中,例如探索木星及其卫星,航天飞缆能够大幅削减机动所需要的燃料量,同时还可提供可靠的电源。

C.航天飞缆是由一根柔性导电的长缆索连接两物体所构成的电动力学缆索系统,能够完成所有常规飞船能完成的任务,而且无需让飞船携带燃料。

D.传统的能源供给方式在探索像木星这样的外行星时捉襟见肘。小题2:不属于科学家将目光投向航天飞缆的原因的是( )

A.以前执行航天任务时,飞船需要携带大量的燃料。

B.要维持国际空间站在预期使用寿命期间的正常运行需要昂贵的难以承受的资金。

C.对于探索像木星这样的外行星问题则更加复杂,它们距太阳太遥远,传统的能源供给方式受到限制。

D.航天飞缆利用基本物理定律来提供定向、人造重力、电能以及推进和拖曳力。小题3:不属于科学家将目光投向航天飞缆的原因的是( )

A.以前执行航天任务时,飞船需要携带大量的燃料。

B.要维持国际空间站在预期使用寿命期间的正常运行需要昂贵的难以承受的资金。

C.对于探索像木星这样的外行星问题则更加复杂,它们距太阳太遥远,传统的能源供给方式受到限制。

D.航天飞缆利用基本物理定律来提供定向、人造重力、电能以及推进和拖曳力。

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