Unless we spend money to spot and
prevent asteroids (小行星) now, one might crash into Earth and destroy
life as we know it, say some scientists.
Asteroids are bigger
versions of the meteoroids (流星) that race across the night sky. Most
orbit the sun far from Earth and don’t threaten us. But there are also thousands
whose orbits put them on a collision course with Earth.
Buy $ 40
million worth of new telescopes right now. Then spend $10 million a year for the
next 25 years to locate most of the space rocks. By the time we spot a fatal
one, the scientists say, we’ll have a w
A. They are heavenly bodies different in composition.
B. They are heavenly bodies similar in nature.
C. There are more asteroids than meteoroids.
D. Asteroids are more mysterious than meteoroids.
更多"Directions: In this part
there ar"的相关试题:
[单项选择] Directions: There are four passages in this part. Each of
the passage is followed by five questions or unfinished statements. For each of
them there are four choices marked A, B, C and D. Choose the best one and mark
your answer on the ANSWER SHEET with a single line through the
center. Passage One
When TV news programs report wars or disasters, the
editors rarely use the most horrifying pictures of dead or wounded victims
because they don’t want to upset their viewers. Even so, viewers are usually
warned in advance that they "may find some of these scenes disturbing", so they
can look away if they choose. But the men and women whose job is to record those
scenes — the TV cameramen — have no such choice. It is their duty to witness the
horrors of the world and record them no matter how gruesome and unpleasant they
may be.
A. it is the duty of TV cameramen to record horrifying scenes
B. TV cameramen’s job is extremely dangerous and emotionally taxing
C. TV programs are reducing the use of horrible pictures of death and wound
D. it is a requirement by work for TV cameramen to disregard people’s wound
[单项选择] Directions: In this part
there are four passages, each followed with five questions or unfinished
statements. For each of them, there are four suggested answers. Choose the one
that you think is the best answer. Mark your ANSWER SHEET by
drawing with a pencil a short bar across the corresponding letter in the
brackets.11-15
For an increasing number of students at
American universities, Old is suddenly in. The reason is obvious: the graying of
America means jobs. Coupled with the aging of the baby-boom (生育高峰) generation, a
longer life span means that the nation’s elderly population is bound to expand
significantly over the next 40 years. By 2040, 25 percent of all Americans will
be older than 65, up from 14 percent in 1995. The change poses profound
questions for government and society, of
A. America has suddenly become a nation of old people
B. gerontology has suddenly become popular
C. name elderly professors are found on American campuses
D. American colleges have realized the need of enrolling older students
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