新GRE阅读理解36套每日讨论--65（qq群178674184）

普渡哥 · 发表于 2011-11-22 09:33:00

Question 4 is based on the following reading passage.

Calculations of the density of alloys based on
Bernal-type models of the alloy‘s metal component
agreed fairly well with the experimentally determined
values from measurements on alloys consisting of a
5 noble metal together with a metalloid, such as alloys of
palladium and silicon, or alloys consisting of iron,
phosphorus, and carbon, although small discrepancies
remained. One difference between real alloys and the
hard spheres used in Bernal models is that the
10 components of an alloy have different sizes, so that
models based on two sizes of spheres are more
appropriate for a binary alloy, for example. The smaller
metalloid atoms of the alloy might fit into holes in the
dense, random-packed structure of the larger metal
atoms.

4. The author's speculation about the appropriateness
of models using spheres of two sizes for binary
alloys would be strongly supported if models using
spheres of two sizes yielded
○A values for density identical to values yielded by
one-sphere models using the smaller spheres
only
○B values for density agreeing nearly perfectly with
experimentally determined values
○C values for density agreeing nearly perfectly with
values yielded by models using spheres of
three sizes
○D significantly different values for density depending
on the size ratio between the two kinds of spheres
used
○E the same values for density as the values for
appropriately chosen models that use only
medium-sized spheres

普渡哥 · 发表于 2011-11-23 08:19:16

大家快来做啊！！

普渡哥 · 发表于 2011-11-23 12:30:51

有谁做了啊？？贴出来，我看对不对。。

普渡哥 · 发表于 2011-11-24 22:12:59

有人做了没？？

ericjee · 发表于 2011-11-26 21:16:52

D是吗？

普渡哥 · 发表于 2011-11-27 10:10:43

正确答案：
B

大家每天做啊，继续加油啊！！

韩洋 · 发表于 2011-11-28 22:55:37

能解释一下吗

[语文] 新GRE阅读理解36套每日讨论--65（qq群178674184）

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