更多"When stars like our Sun die, they b"的相关试题:
[单项选择]When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain how exactly dying stars could blow away these clouds. Now astrophysicists propose that unexpected chemical reactions during the formation of stardust could help solve this mystery.
Stars smaller than the Sun and up to eight times as massive die by swelling up into red giants before shedding most of their mass to shrink into very compact, dying embers (灰烬) called white dwarfs. Two kinds of red giants exist-those with lots of carbon, and others richer in oxygen than in carbon. Carbon-rich stars release carbon particles during their death throes. Scientists proposed these pitch-black grains absorb rays from the dying star and get shot into space by starlight, a theory that fit both the observations and computer models.
Increasingly, however, researchers could not explain how oxygen
A. explain-the possible way of death of our Sun.
B. show the two types of red giants.
C. discuss on the way of red giants to become white dwarfs.
D. explore the origin of life.
[单项选择]When did Queen Victoria die（）
A. In 2000.
B. In 1910.
C. In 1901.
D. In 1900.
[单项选择]
M: I don’t like our son at all. I like our daughter very much.
W: He is handsome and he is so bright that he is the best one in his class. Why don’t you like him
M: Because he will not treat us well when we are too old to do anything.
W: How do you know that
M: I have learned that from what you and I did.
How does the wife like her son（）
A. Her son is handsome and bright.
B. Her son isn’t a good boy.
C. Her son is bad.
[单项选择]When did Lincoln die
A. On the evening of April 14, 1865.
B. On the night of April 15, 1865.
C. On the morning of April 15, 1865.
[单项选择]When people download Sun’s Java program, they can choose to install ______.
A. Open-Office software
B. Google searching Toolbar
C. Microsoft Office
D. Yahoo searching Toolbar
[单项选择]When something happens to shake our culture—like the terrorist attacks—we pause, not merely from fear. A deeper self-examination is going on all over the country. And love, family and faith are emerging.
Single people are flocking to dating services, looking for committed relationships. Bridal retailers report a surge in sales. Sales of old-fashioned board games have skyrocketed.
The new appreciation for time spent with those we love poses a great spiritual question to materialistic yuppies and workaholic careerists, and that question is this: "Was your life before September 11 really working for you " To many, the answer is no.
We once heard of a CEO who spoke at his retirement dinner to a group of your executives. He said, "I know you want my job, and I’ll tell you how to get it. Last week my daughter was married, and as she walked down the aisle, I realized I did not know the name of her best friend, or the last book she read, or her favorite color. That’s the p
A. A．1) to mean ______. refiecting on the reason for the attacksB. checking up on one’s physical conditionC. looking Into one’s values and attitudesD. confronting painful reality
