题目内容
Have you heard about the periodic table (元素周期表) lately? Well, there’s some big news about this special table, but first, remember that the periodic table is used for all the elements（元素）, or things that make up our world.
Elements are all around us. Iron is one of the most common elements found on the earth. You probably know the element oxygen (氧), which is the element that we breathe in all the time. And elements can combine (结合) to make new things like H2O. This is hydrogen (氢) and oxygen put together, also known as water! Learning about these things helps us better understand the world we live in.
But have you ever noticed something missing in the periodic table? There were already 114 elements. But the seventh row of the table was not finished, until now!
In December, scientists from the IUPAC（国际纯粹与应用化学联合会) found the four elements that were missing. They are elements 113, 115, 117 and 118.
“To scientists, this is of greater value than an Olympic gold medal,” Ryoji Noyori, a Nobel honored chemist said.
The new elements are heavy metals and were made in lab. These kinds of elements can’t be found in nature. Scientists are still looking for ways to use these elements, and other elements in the eighth row in our daily lives.
Scientists have been working on this for 10 years, but the work is not done. Now they will prepare to look for “element 119 and beyond”. But for now, be mindful (留心的) when you read your science books because the periodic table might be outdated (过时的).
1. In Paragraph 2, the writer mainly talks about_________.
A. examples of some common elements
B. the importance of oxygen
C. how elements make new things
D. how to learn about elements
2.The newly found elements are ________.
A. elements 113, 114, 115, 116
B. elements 113, 114, 117, 118
C. elements 113, 115, 117, 118
D. elements 113, 115, 117, 119
3.The underlined word “beyond” means ________ in the last paragraph.
A.更前面 B.更后面 C.更上面 D.更里面
4.Which of the following about the new elements is NOT true?
A. They are heavy metals.
B. They were made in labs.
C. They can’t be found in nature.
D. They are widely used in our daily lives.
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阅读下面的短文，根据短文内容完成表格中所缺信息，每空一词。
Our Earth is welcoming a great day soon. April 22 is Earth Day. It’s a day for us to take care of the Earth. So what can we do to help? Around the world, many cities and countries find ways to make themselves green.
Chicago is famous for its green roofs(屋顶). There are plants on these roofs. These plants store(储存) much rainwater. Later, the water goes back to the air to make the city cool and clean.
Singapore is home to the first zero-energy(能量) building in Southeast Asia. Zero energy means a building makes more energy than it uses.
Curitiba, Brazil, has buses called BRT. BRT runs on special lanes(车道) so it will always be on time, even in traffic jams. Thanks to BRT, the air in the city is very clean. Today, many other countries have BRT, such as China and Mexico.
We only have one Earth, so we have to take care of her.
Something about 1. Day
2. | April 22nd | |
Aims (目的) | It’s a day for us to look after it. | |
3. | Chicago | It is 4. for green roofs. The people plant small trees and 5. on the roof to keep the water. And the water makes the city 6. and clean. |
7. | It is home to the first zero-energy building in 8. Asia. | |
Curitiba | They use 9. to make the 10. in the city clean. | |