Unit 3 A healthy life 知识点题库

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    Mosquitoes have an extraordinary ability to find humans far away and fly straight to their skin. Mosquitoes can do more than cause an itchy (发痒的）wound. Some mosquitoes spread several serious diseases, including Dengue, yellow fever and malaria.

    Over one million people worldwide die from these diseases each year. New research now shows how mosquitoes choose who to bite.

    Mosquitoes need blood to survive. They are attracted to human skin and breath. They smell the carbon dioxide gas, which all mammals breathe out. This gas is the main way for mosquitoes to know that a warm-blooded creature is nearby.

    But mosquitoes also use their eyes and sense of touch. Michael Dickinson is a professor at the California Institute of Technology. His research shows how these small insects, with even smaller brains, use three senses to find a blood meal.

    Michael Dickinson's team used plumes—a material that rises into the air of carbon dioxide gas into a wind tunnel (隧道). They then used cameras to record the mosquitoes. The insects followed the plume.

    Then, the scientists placed dark objects on the lighter colored floor and walls of the tunnel. Mr. Dickinson said, at first, the mosquitoes showed no interest in the objects at all. “What was quite surprising is that the mosquitoes fly back and forth for hours. These are hungry females and they completely ignore the objects on the floor and wall of the tunnel. But the moment they get a hit of CO₂, they change their behavior quite obviously and now would become attracted to these little visual blobs (斑点).”

    This suggested to the researchers that a mosquito's sense of smell is more important in the search for food. Once mosquitoes catch a smell of a human or animal, they also follow visual signals.

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（﹨）划掉。

删除：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    I got up early this morning, so I went to school without breakfast. I walked in so a hurry that I stepped on a banana peel dropped by an old man walk in front of me. As the result, I fell in my back. I am so angry that I wanted to blame the old man, so I controlled myself at last. I picked the banana peel, putting it into the dustbin and ran to school. The class had begun, but I was very happy because I did that what I should do to protect our environment.

There are about 3,900 wild tigers left in the world and the illegal trade is one of the biggest threats to their (幸存).

It has been proved eating vegetables in childhood helps to protect you against serious illness in later life.

—How are you doing all these years, Jim?

—Nothing new. Everything is going on it was years ago.

It is not how much we do but how much love we put into what we do benefits our work most.

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（ ），并在其下面写出该加的词。

删除：把多余的词用（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    Last Friday we have a discussion about whether it is the only way out for senior students to go to college.

    The majority of us considering it very necessary to go to college. They think it can be widen their knowledge and improve their qualities. Only in this way can they find better jobs before graduation. Very few students think it no use go to university. Moreover, it's rather hard for graduates look for satisfied jobs. Thirty percents of the students believe it doesn't make some difference whether they go to college or not.

    In my opinion, we can better themselves through college education so that we can serve society better in the future.