一、阅读短文,从A、B、C、D四个选项中选择一个正确答案填空。1. When you look up into the sky in a summer night, you can seeA. the bright moonB. many starss C. a bal of fire D. both A and B2. The moon isA. larger than the sunB. hot
,用T/F表示。()1.The sun isn't a star.()2.The sun's core is hotter than its surface.()3.We could not live without the sun because it gives us light and heat.()4.The sun does no harm to man at all.()5.To protect our skin,we need to wear sunscreen.Thesun is a star. ...
If a star is 20 times heavier than the sun, what will it be in future? AA white dwarf BSupernova CRed giant star DNone of theseSubmit In the carbon cycle from which stars hotter than the sun obtain their energy the .6C12 isotope Asplits up into three alpha particles Bfuses with ...
Take the sun, for example. You'd think that its surface would be hotter than its outer atmosphere, since the surface is closer to the nuclear furnace at the sun's core. After all, when you're sitting in front of a fireplace, it feels hotter when you get closer to it, right? But ...
[解析] 根据文章第一段第二句“The Sun has existed in its present state for about 4 billion. 600 million years.和第二段第二句和最后一句About 5 billon years from now.the core of the sun will shrink.and become hotter.The sun will then be a red giant star.”可知,文章第一段说太阳作 为...
B. Stars do not all look the same.C. The sun cannot get light from other stars.D. The surface of the sun is hotter than its center.( )What is the best title for the passage?A. The differences between the sun and Earth.B. Why the sun is hot.C. The closest star to Earth.D....
The sun is our star. Our planet Earth orbits the sun. The sun makes a lot of heat and light.Its surface is about 100 times hotter than a hot summer day! It's also very big. One million Earths could fit inside the sun. Our sun and Earth are part of what we call our solar sys...
White stars are hotter than red and yellow. Blue stars are the hottest stars of all. What is the most beautiful star? 2 days ago · What is the most beautiful star? Sirius A (Alpha Canis Majoris) Our number one star on the list. Canopus (Alpha Carinae) Rigil Kentaurus (Alpha Centauri...
It looks like a hot and bright plate. But it is a ball. It is much hotter than any fire. 2.The sun is a star. Many stars are much bigger than the sun. The sun is much nearer to us,3.At night we can see the moon and many stars. The moon is a round ball. I
There is no air or water on the moon so there are not any trees or animals or people on the moon. The moon gets its light from the sun but some places on the moon are quite dark. The days on the moon get hotter than boiling (煮开的) water. The nights get colder than the ...