请教一下NO.5 第二套SECTION2长阅读

NO_BOUNDRIESUID：3362402

　　　We can distinguish three different
　　realms of matter, three levels on the
　　quantum ladder. The first is the atomic
　　realm, which includes the world of
(5) atoms, their interactions, and the
　　structures that are formed by them,
　　such as molecules, liquids and solids,
　　and gases and plasmas. This realm
　　includes all the phenomena of atomic
(10) physics, chemistry, and, in a certain
　　sense, biology. The energy exchanges
　　taking place in this realm are of a
　　relatively low order. If these exchanges
　　are below one electron volt, such as in
(15) the collisions between molecules of the
　　air in a room, then atoms and molecules
　　can be regarded as elementary particles.
　　That is, they have "conditional
　　elementarity" because they keep their
(20) identity and do not change in any
　　collisions or in other processes at
　　these low energy exchanges. If one goes
　　to higher energy exchanges, say 10,000
　　electron volts, then atoms and
(25) molecules will decompose into nuclei
　　and electrons; at this level, the
　　latter particles must be considered
　　as elementary. We find examples of
　　structures and processes of this first
(30) rung of the quantum ladder on Earth, on
　　planets, and on the surfaces of stars.
　　　The next rung is the nuclear realm.
　　Here the energy exchanges are much
　　higher, on the order of millions of
(35) electron volts. As long as we are
　　dealing with phenomena in the atomic
　　realm, such amounts of energy are
　　unavailable, and most nuclei are inert:
　　they do not change. However, if one
(40) applies energies of millions of
　　electron volts, nuclear reactions,
　　fission and fusion, and the processes
　　of radioactivity occur; our elementary
　　particles then are protons, neutrons,
(45) and electrons. In addition, nuclear
　　processes produce neutrinos, particles
　　that have no detectable mass or charge.
　　In the universe, energies at this level
　　are available in the centers of stars
(50) and in star explosions. Indeed, the
　　energy radiated by the stars is produced
　　by nuclear reactions. The natural
　　radioactivity we find on Earth is the
　　long-lived remnant of the time when
(55) now-earthly matter was expelled into
　　space by a major stellar explosion.
　　　The third rung of the quantum ladder
　　is the subnuclear realm. Here we are
　　dealing with energy exchangers of many
(60) billions of electron volts. We encounter
　　excited nucleons, new types of particles
　　such as mesons, heavy electrons,
　　quarks, and gluons, and also antimatter
　　in large quantities. The gluons are the
(65) quanta, or smallest units, of the force
　　(the strong force) that keeps the quarks
　　together. As long as we are dealing with
　　the atomic or nuclear realm, these new
　　types of particles do not occur and the
(70) nucleons remain inert. But at
　　subnuclear energy levels, the nucleons
　　and mesons appear to be composed of
　　quarks, so that the quarks and gluons
　　figure as elementary particles.

27 The passage speaks of particles as
having conditional elementarity if they
A remain unchanged at given level of
energy exchange
B cannot be decomposed into smaller
constituents
C are mathematically simpler than some
other set of particles
D release energy at a low level in
collisions
E belong to the nuclear level on the
quantum ladder
感觉A与B很不好选择，该怎么判断呢？

ecustdreamerUID：3396543

楼主看L14If these exchanges are below one electron volt,
L24 If one goes to higher energy exchanges, say 10,000 electron volts
L39 if one  applies energies of millions of electron volts,
很明显文章是以energy exchange level进行的分类
关于B选项L19：‘conditional elementarity’的定义keep their identity，重点是don not change
可以再L14、18、39附近提炼主动词并不只有decompose，还有fission and fusion等
所以B是以偏概全的错误。
第一次回跌，希望能有帮助。

NO_BOUNDRIESUID：3362402

ecustdreamer 发表于 2012-11-13 16:03
楼主看L14If these exchanges are below one electron volt,
L24 If one goes to higher energy exchanges ...

你一点拨之后发现题目骤然变得好简单。
太感谢你啦！

G·MardisUID：3337058

想補充一點，B並不儘是以偏概全的問題，而是違反物理常識了吧…… 可能因為專業相關，我很果斷選A 了