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题型:阅读选择 题类:真题 难易度:普通

    Every object has weight. But the center of its weight is not always in the middle of the object. If the top of an object is heavier than its bottom, it will fall over easily. We say that its center of gravity is high. But if the bottom is heavier, it won't fall easily. Then we say that its center of gravity is low.
    Look at the first picture. This empty box must fall over, because its center of gravity (C) is not above the line of its bottom (AB).
Now look at the second picture. There is some heavy iron in the bottom of this box. It will not fall, because its center of gravity is above its bottom.



(1)、If the bottom of an object is ______ its top, it will fall over easily.

A、lighter than B、heavier than C、no heavier than D、as heavy as
(2)、Please point out which box will not fall.

A、 B、 C、 D、
(3)、The main idea of the passage is _________.

A、why things fall over B、a low center of gravity C、a high center of gravity D、that everything has weight
举一反三
阅读短文,从每小题所给的四个选项中,选出能回答所提问题或完成所给句子的最佳答案。

    For us humans, one of the greatest experiences is to taste all kinds of delicious food. But for penguins, they cannot get a taste of this happiness. That's because penguins can't actually taste the delicious flavors (味道) of their favorite food-fish!

    Scientists from the University of Michigan examined the genome (基因组)of five species of penguins. They found that no one can taste umami (鲜味),the flavor of meat or fish, the BBC reported.

    Many animals have five basic tastes: sweet, sour, salty, bitter and umami. But according to genetic data, penguins are believed to have only sour and salty tastes.

    These findings are surprising and puzzling. And scientists don't have a good explanation for them. But they have a few ideas.

    First, one of the umami genes doesn't work in cold temperatures. "It's about zero degrees when they eat cold fish," Zhang Jianzhi, the lead scientist, told the Daily Mail, so even if the penguins had a functional (功能的)gene, it might not work when they needed it.

    Second, penguins' tongues (舌头) are very special which may have something to do with their lack of taste. Instead of being covered with taste buds which help to taste food, penguins' tongues are very spiky. This is better for them to hold slippery (滑的) fish than tasting them. One study even showed that some types of penguins don't even have taste buds.

    However, penguins seem to be managing just fine.

    "Their behavior of swallowing food whole, and their tongue structure and function, suggest that penguins need no taste perception," said Zhang.

 阅读理解

You might have seen beautiful rainbows in the sky before. They form when sunlight falls on water drops in the air. But in fact, moonlight can also create rainbows in the same way. They are called "moonbows". They are similar to rainbows, but they are created by moonlight. 

Moonbows are more unusual than rainbows. Different weather and astronomical (天文学的) conditions have to be just right for moonbows to be created. The moon has to be very low in the sky — only 42 degrees from the horizon (地平线). The moon has to be a full moon or nearly full. The sky must be very dark for a moonbow to be watched clearly — any bright light can obscure it. Water drops must appear in the air in the opposite direction of the moon. Moonbows appear on the opposite side of the moon and usually look white to the human eye. This is because their colors are not bright enough to be noticed by the human eye. 

Moonbows more often appear in some locations around the world. Most of these locations usually have waterfalls, which create thin fog in the air. Some of these locations are the Yosemite National Park in California, Cumberland Falls State Resort Park in Kentucky and Waimea in Hawaii, US. 

Moonbows do really happen. So at a certain time and a certain place, when a moonbow happens to appear, you can't miss it if you're right there.

 阅读下列材料,从每题所给的A、B、C、D四个选项中选出最佳选项。

We all want to get along with our friends, family, and other people. We understand that how we act and what we say is important. For example, using polite words such as please and thank you shows that we care about other people's feelings. 

However, we don't always know the right way to act when we are angry or do not agree with others. When these happen, we just think about how angry we feel. We never remember that the problem may have started with a simple mistake, such as gossip(流言蜚语). For example, when we say untrue things about another person, we hardly know whether that person may feel hurt or angry. But they exactly do. 

Things like gossip often make us unhappy or hurt because we have feelings. Although our feelings are inside us, they sometimes show on the outside. In other words, people can see our happy face. They can hear our angry voice. We also show feelings by the way we act. 

The way we show our feelings is very important when we get along with other people. So share our feelings in clever and proper ways if we feel angry. And how? We can control them. For example, speak calmly, and don't shout. Listen politely and don't interrupt(打断). Respect (尊敬)the other person's feelings. 

Actions that hurt people make things worse, not better. So we should share our feelings, talk about what we want, and work things out with other people. 

 阅读下面材料,从方框中所给的A~E五个选项中选出正确选项(其中一项是多余选项),将其序号填入小题,并回答问题。

 Traveling is a great way to see new things, meet new people, and try new foods. But when you travel, it's important to be a good visitor and follow some simple rules.

◎{#blank#}1{#/blank#} This will help you be a good traveler no matter where you go.

◎Speak softly People in different places have different ideas about how loud is too loud.

{#blank#}2{#/blank#} If you talk too loudly in public, people might not like you. In some places, like Japan, talking loudly is seen as rude.

◎Dress right. Wear clothes that are okay with the local people and their beliefs. In some Muslim countries, women are expected to wear a headscarf in public. {#blank#}3{#/blank#}

◎Don't litter. Leaving trash on the ground is very impolite in any place. If you can't find a littering box, keep your trash with you until you can throw it away properly. {#blank#}4{#/blank#} Always follow the simple rules, you can have a great trip and show respect to the places and people you visit.

A. In Hong Kong, you could be fined(罚)$1,500 for littering.

B. Always be open to new things.

C. Never travel to a place far away alone.

D. In France, you can't wear clothes that cover your face.

E. Try to keep your voice down and don't shout.

To be a good traveller, what else can you do?(请用不超过15个单词回答问题) {#blank#}5{#/blank#}

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