Q37:

It can be inferred from the passage that which of the following is an accurate physical description of typical low-surface-brightness galaxies?

They are large spiral galaxies containing fewer stars than do conventional galaxies. They are compact but very dim spiral galaxies. They are diffuse spiral galaxies that occupy a large volume of space. They are small, young spiral galaxies that contain a high proportion of primordial gas. They are large, dense spirals with low luminosity

答案为d 这里small不对啊 我选a

只要看这里就很明显了

these galaxies have the

same general shape and even

the same approximate number

(10) of stars as a common type of

conventional galaxy, the spiral,

but tend to be much larger.

Because these galaxies’

mass is spread out over

(15) larger areas, they have far

fewer stars per unit volume

没可能小阿？ 请教。

以下是原文：

Q35 to Q37:

In addition to conventional

galaxies, the universe contains

very dim galaxies that until

Line recently went unnoticed by

(5) astronomers. Possibly as

numerous as conventional gal-

axies, these galaxies have the

same general shape and even

the same approximate number

(10) of stars as a common type of

conventional galaxy, the spiral,

but tend to be much larger.

Because these galaxies’

mass is spread out over

(15) larger areas, they have far

fewer stars per unit volume

than do conventional galaxies.

Apparently these low-surface-

brightness galaxies, as they

(20) are called, take much longer

than conventional galaxies to

condense their primordial gas

and convert it to stars—that is,

they evolve much more slowly.

(25) These galaxies may

constitute an answer to the long-

standing puzzle of the missing

baryonic mass in the universe.

Baryons—subatomic particles

(30) that are generally protons or

neutrons—are the source of

stellar, and therefore galactic,

luminosity, and so their numbers

can be estimated based on how

(35) luminous galaxies are. How-

ever, the amount of helium

in the universe, as measured

by spectroscopy, suggests

that there are far more baryons

(40) in the universe than estimates

based on galactic luminosity

indicate. Astronomers have

long speculated that the missing

baryonic mass might eventually

(45) be discovered in intergalactic

space or as some large popu-

lation of galaxies that are difficult

to detect.

偶选C.

星星的数量少只是在单位体积内. 总的数量还是差不多的. 所以偶不选A.