6.分析:that crashed on the Earth 是定语从句, 先行词是 an asteroid,关系词在从句中作主语,因此 that不可省略,但可 换成which;led to“导致”作主句的谓语,to为介词,后接名 词/代词/动名词;that had ever walked on our planet--the dinosaurs 也是定语从句。 译文:六千五百万年前,一颗小行星撞上了...
1.细节辨析题,根据文章Our planet(星球), the earth, is becoming more and more crowed and the environment is badly polluted.我们的地球变得很拥挤,并且环境被严重污染。 2.细节辨析题,根据文章But in 2100, the spaceship can travel at half the speed of light. It might take us two or three days...
The discovery that there is water there, especially ice deep within polar craters where the sun nevershines. That is a potentially invaluable source of drinking water for future astronauts visiting the moon, but also for wa...
The Earth is the third planet from the Sun and the only planet known to have life on it. It is the fifth largest planet in the solar system and has a diameter of about 12,756 kilometers. The Earth's surface is made up of land and water, with about 29.2% of the surface land and...
【1】根据The Earth is a planet and it goes around the Sun. Seven other planets also go around the Sun.可知,有八个行星围绕着太阳转。故答案为:eight。 【2】根据scientists think there may be no life on them.可知,除了地球上之外,在其他的行星上没有生命存在。故答案为:except。
Earth and the sun, this comet-like tail dusts the side of our world that is facing the sun. Our planet's gravity pinches that sodium stream, narrowing it into a beam, invisible to the naked eye, that wraps around Earth's atmosphere and shoots out into space from the opposite side of ...
Okay, Georgie, we'll find out the answer at the end of the program. In some ways, the current interest in the moon is really more about the origins of earth. One theory is that during the early days of the Solar system, around 4 billi...
Coral polyps (珊瑚虫), which live in the warm, shallow parts of the Earth’s oceans, are probably the biggest builders on the planet. Coral polyps turn calcium from seawater into a hard material called limestone. Slowly, they build up a hard skeleton (骨架) around their bodies. When polyp...
the researchers took off in a rented business jet, with 25 cameras and spectrometers mounted by the windows. The hope was that they’d be able to gather priceless insights into the physical and chemical processes that occur when satellites burn up as they fall to Earth at the end of their...
Welcome to the “Best Photo of the Month” competition showcasing and celebrating the biodiversity of Planet Earth. Voting is easy and lots of fun. By popular request the number of images to be selected has been increased to six. First click an image and the slideshow will start automatically...