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UNIT2课时跟踪检测(二)
语言运用综合练
I.阅读理解
By November 2018,about 1,200 planets in total
Some people will say that you can place a value had been looked at.Most of them were worthless
on anything.We may know the price of milk.We can because of their unsatisfactory conditions.So should
also find out the value of the most expensive building you run to the bank and borrow $16,500 so you can
in the world.Do you think it is possible to put a price buy Mars?Maybe not today.You should just enjoy
on the Earth or other planets?
the five-quadrillion-dollar planet you already live
You probably think this is impossible.Scientist on-and learn how to look after it.
Greg Laughlin thought differently.In March 2009,1.What purpose does the first paragraph serve?
NASA sent the Kepler telescope into space to A.To describe the prices of different things.
explore the Milky Way galaxy and to find Earth-B.To bring up the topic of values of planets.
sized planets orbiting (other stars.As there C.To introduce a scientific question.
are billions of stars within the Milky Way,it could D.To show a research result.
mean there were several thousand planets to 2.What part of Laughlin's formula is the most valuable?
discover.How could scientists decide which ones to A.A planet's temperature.
study further and which ones to take no notice of?
B.A planet's age and size.
Professor Laughlin used information received C.The amount of energy a planet creates.
from the Kepler telescope to create a formula (D.The possibility for life to live on a planet.
that puts a price on planets.The age and size of each 3.What does the underlined word"That"in Paragraph 4
planet,its temperature,and the energy it created
refer to?
were considered.Older planets were given a higher
A.Venus was valueless.
value.The most important consideration was whether or
B.Venus is too close to the Sun.
not it may be possible for life to live on the planet.
C.Mars was much cheaper than Earth.
By using his formula,Professor Laughlin found