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题型:阅读选择 题类:常考题 难易度:困难

北京市海淀区2019届九年级下学期英语5月期中考试试卷

阅读理解

    You're not the same person you were as a child. You're not even the same person you were five years ago. We don't just mean your personality. While we'd love to start a never-ending discussion over the "true self", we're here to talk about the cells(细胞)in your body.

    Do you know how your fingernails and hair are constantly growing and replacing themselves? The same thing happens almost everywhere in your body. Your outer layer of skin makes way for fresher skin, and inside your veins(血管), blood cells turn over to make way for fresh blood. It's probably no surprise that these types of cells are short-lived, even some of the most seemingly permanent(永久的)parts of your body replace themselves over time-including your bones.

    Strong as your bones might seem, the cells they're made of won't last a lifetime. Bones are masters at rebuilding themselves, which is why most broken bones can heal on their own into the right shape.

    Bones have special cells called osteoclasts(破骨细胞)whose job is to break down bone, even if it isn't broken, and send the minerals into the blood stream. This may sound frighteningly like your bones are wearing away, but your body knows what it's doing. As osteoclasts break down bone, osteoblasts(成骨细胞)build up new bone to replace the old. By the end of each year, about 10 percent of your entire adult skeleton will have been rebuilt through this process.

    If 10 percent of your bone breaks down every year, it must take about ten years to renew 100 percent of your skeleton. That would be a great guess, and it lines up nicely with the medical myth that the human body's cells are fully replaced every seven years, but the body is a bit more complex. That 10 percent is just an average-some bone grows faster than that, and some grows slower. While some parts of your bone will turn over quickly, other parts will stick around for decades. In fact, most bone cells could live as long as 50 years.

    So before you get wrapped up in an identity crisis(危机)about the cells in your body disappearing on you, know that you can lose some hair and you can cut your nails, but the bones of you aren't going anywhere-at least not very soon and not all at once.

(1)、Which of the following is TRUE according to the passage?
A、All the cells in our body are the same ones that we were born with. B、Our blood cells are constantly growing and replacing themselves. C、It must take about 10 years to rebuild 100 percent of our skeleton. D、Osteoblasts can break down skin and also rebuild it over time.
(2)、The underlined words "wearing away" probably mean "______".
A、building up B、taking off C、dying out D、turning on
(3)、What does the passage mainly talk about?
A、Our skeleton seems permanent but renews itself over time. B、It is not surprising that some cells in our body are short-lived. C、There are two types of cells in our bones: osteoclasts and osteoblasts. D、We are not the same person we were five years ago because of personality.
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As fall comes, Germany holds its biggest beer festival—Oktoberfest(啤酒节). Oktoberest is probably the most well—known folk festival worldwide . It is also known for the drinking of beer worldwide. The celebration begins in late September and lasts until the first Sunday in October. Each year more than 6 million people around the world attend .

Beer has been a main product of German society for centuries and drinking beer has been a part of German tradition and culture . There are over 7.000 different kinds of beer brewed(酿造) in Germany . Drinking beer in Germany is a tradition that has been passed down from generation to generation. It has been a way of life that Germans have accepted and it has become a sign of Germans. They take great pride in their beer, going so far as to write the German Beer Purity Law in 1516 that is still in use today.

Why do Germans like beer so much ? Though beer wasn't invented in Germany , it was very popular because it was safer to drink than water. Beer is made from grain (粮食). In the past , people saw it as a kind of"food". Also, water in the past was—always polluted , so Germans have historically drunk beer instead of clean water.

If you were to visit Germany , it would be advisable to try the beer that is most popular in that region, like Pilsner, wheat beer and lager. The art of brewing beer has been practiced for centuries and Germans are masters at their brewing craft(工艺)!66、67题完成句子: 68~70题简略回答问题。

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