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完形填空及解析
Dalton wondered why the heavier and lighter gasesin the atmosphere did not
separate as oil and water do. He finally concluded that the constituent 1 must
exist in the form of 2 particlesor atoms and that these 3 be
completely mixed together in the 4 .This threw a new light in 5 laws
of definiteproportions.It was 6
necessary to suppose that the atoms
7
combinesintos small groups of uniform 8
and so form more
complex substance; 9 the mystery of this law was 10 . Dalton
suggested, for example, that carbon monoxide
11 formed by the one with one
12 of atoms of carbon and oxygen, 13 carbon dioxide results from a
single
of carbon uniting with two atoms
oxygen. Assuming this
to be true, 16 the definite proportions of Prouts law ( 17 all chemical
compounds the differentconstituents 18
enter in unvarying proportions)
would naturally 19 atoms.
the relativeweights of the many 20
kinds of
1. A.
gases
B.
pieces
C.
things
D.
gas
2. A.
timely
B.
trimmed
C.
tiny
D.
topical
3. A.
ought
B.
could
C.
will
D.
must
4. A.
sky
B.
atmosphere
C.
oxygen
D.
environment
5. A.
various
B.
many
C.
the
D.
those
6. A.
only
B.
too
C.
that
D.
extremely
7. A.
should
B.
were
C.
get
D.
could
8. A.
construct
B.
structure
C.
piece
D.
feature
9. A.
but
B.
also
C.
thus
D.
nevertheless
10. A.
solved
B.
discovered
C.
broked
D.
told
11. A.
must
B.
been
C.
were
D.
is
12. A.
putting
B.
pairing
C.
placing
D.
preparing
13. A.
while
B.
when
C.
therefore
D.
also
14. A.
piece
B.
type
C.
atom
D.
measure
15. A.
from
B.
in
C.
of
D.
for
16. A.
then
B.
so
C.
by
D.
that
17. A.
from
B.
in
C.
to
D.
for
18. A.
are
B.
wouldn’t
C.
always
D.
never
19. A.
describe
B.
unit
C.
mix
D.
reveal
20. A.
different
B.
usual
C.
important
D.
chemical
解析
【答案】A
【解析】根据上文中的 heavier and lightergases 可以确定,本空中应填入“组成的气体”,即constituent gase。s
【答案】C
【解析】根据句子意思判断,句中的词意为微粒的意思,选项C.tiny合乎题意。 3.【答案】D
【解析】情态动词must 在这里是“必定、必须”的意思。
【答案】B
【解析】sky 意为“天空”,atmosphere 意为“大气”, oxygen意为“氧气”, environment意为 “环境”
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