题目内容
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Yee smashed his moons to pieces because ______.
A．he no longer liked them
B．the moons lost their attraction
C．he wanted to make Lan feel better
D．other planets felt jealous
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Earth formed about 4.5 billion years ago. The first 500 million years of its life are known as the Hadean Eon. Although this time amounts to more than 10 percent of Earth’s history, little is known about it, since few rocks are known that are older than 3.8 billion years old.
For much of the Hadean, Earth and its sister worlds in the inner solar system were pummeled with an extraordinary number of cosmic impacts. “It was thought that because of these asteroids and comets flying around colliding with Earth, conditions on early Earth may have been hellish, ” said lead study author Simone Marchi, a planetary scientist at the Southwest Research Institute in Boulder, Colorado. This imagined hellishness gave the eon its name —Hadean comes from Hades, the lord of the underworld in Greek mythology.
However, in the past dozen years or so, a radically different picture of the Hadean began to emerge. Analysis of minerals trapped within microscopiczircon crystals dating from this econ “suggested that there was liquid water on the surface of the Earth back then, clashing with the previous picture that the Hadean was hellish,” Marchi said. This could explain why the evidence of the earliest life on Earth appears during the Hadean —maybe the planet was less inhospitable during that eon than previously thought.
The exact timing and magnitude of the impacts that smashed Earth during the Hadean are unknown. To get an idea of the effects of this bombardment, Machi and his colleagues looked at the moon, whose heavily cratered surface helped model the battering that its close neighbor Earth must have experienced back then.
“We also looked at highly siderophile elements (elements that bind tightly to iron), such as gold, delivered to Earth as a result of these early collisions, and the amounts of these elements tells us the total mass accreted by Earth as the results of these collisions,”Marchi said. Prior research suggests these impacts probably contributed less than 0.5 percent of the Earth’s present-day mass. The researchers discovered that “the surface of the Earth during the Hadean was heavily affected by very large collisions, by impactors [ ？m&39;p？kt？] larger than 100 kilometers (60 miles) or so — really, really big impactors, ’ Marci said. “When Earth has a collision with an object that big, that melts a large volume of the Earth’s crust and mantle, covering a large fraction of the surface,” Marchi added. These findings suggest that Earth ’s surface was buried over and over again by large volumes of molten rock —enough to cover the surface of the Earth several times. This helps explain why so few rock survive from the Hadean, the researchers said.
Why is little known about the Earth ’s first 500 million years？
A.Because it is an imagined period of time.
B.Because this period is of little significance.
C.Because it is impossible to know about this period.
D.Because no rocks are available as research evidence.
Why is the early Earth imagined to be hellish？A.Because it was often smashed by asteroids and comets.
B.Because back then Hades, the lord of Hell, resigned.
C.Because it was so according to Greek mythology.
D.Because back then there was no life.
Why was the early Earth in fact less inhospitable than often thought？A.Because minerals of the Hadean have been found suggesting the existence of life.
B.Because the clashing brought by asteroids and comets was not completely damaging.
C.Because during the Hadean there already existed the evidence of life.
D.Because there had already been liquid water on the Earth back then.
How can the moon help with the understanding of the impacts that smashed the Earth？A.The moon once smashed into the Earth too.
B.The moon was battered earlier than the Earth.
C.The moon, as a close neighbor, is easier to observe.
D.The moon’s surface is heavily cratered as the Earth ’s.
请帮忙给出每个问题的正确答案和分析，谢谢！
In a bold promotional ______ for the movie, he smashed his car into a passing truck.
A．aerobics
B．adobe
C．sod
D．stunt
A.over the moon
B.on the moon
C.off the moon
D.above the moon
听力原文： A small dog brought disaster to a small English town last week. It was trying to cross a busy street but was too frightened to leave the strip in the middle of the street.
A truck driver parked his truck on the side of the road and got out to help it. While he was going to get the dog, his track rolled down the street. It smashed into four parked cars, crashed through a fence, rolled down a bank and smashed into a row of houses. Only the driver was hurt. The dog bit him on the hand while he was carrying it.
Here is another story about dogs. A nine-year-old child, who nearly drowned while she was swimming in a home swimming pool, was saved by the family dog on Saturday. The child was alone in the large pool at the time.
The family of the dog said it would receive an extra large bone as a reward.
(33)
A．It smashed into a row of houses.
B．It was run over by a truck.
C．It was too nervous to leave the strip in the middle of the road.
D．It hit a truck.
The question of going to Sun Moon Lake ______ his mind.
A．preoccupied
B．predominated
C．preceded
D．prepossessed
According to the text, Neil Armstrong______.
A．was awed by the author for his greatness
B．wrote the book entitled A Band of Brothers
C．enjoyed the experience of walking on the moon
D．was requested an interview about walking on the moon by the author in the 1990s
A、he is not a naturally gifted astronaut
B、he threw his silver NASA badge into the distance on Moon
C、people have lost interest in any more moonwalkers after Neil Armstrong had "claimed the prize."
D、he dampened people's excitement about moon walking by admitting his disappointment in the Moon.
A．find out which rock contains more iron
B．see how hot it needs to vaporize irons
C．investigate how the Moon was formed
D．estimate which rock is more valuable
The thing Jules described in his book From the Earth to the Moon is ______.
A．as large as the spaceship today.
B．similar to the spaceship today.
C．a gun used to send up a ship.
D．an underwater ship.
______ is Maughams best-known work which is also regarded as his autobiographical novel.
A．The Razor"s edge
B．The Moon and Sixpence
C．Cakes and Ale
D．Of Human Bondage
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