请教几个语法问题

1 The lenses in an optical microscope bend the light passing through a specimen to form an image of that specimen that is mch larger _ actually viewed.

a than it    b. than the one  c. one than  d. than one which

请问a.b.中的it 和the one 有什么区别，答案是b,我选的是a

2._substances include various forms of silica,pumice,and emery.

a. Natural abrasive occur       b. Abrasion occurs in natural

c.Naturally occurring abrasive    d.A natural occurrence of abrasion

3._of large mammals once dominated the North American prairies the American bison and the pronghorn antelope.

a.There are two species   b.With two  species   

c.Two species are           d.Two species

答案是d,我选的是a 我觉得这道题好像出的有问题 ，几个选项放进去不通顺

4.Although pure diamond is colorless and transparent, when contaminated with other material it may appear in various color,ranging from pastels to opaque black

这里的color       应该是复数colors吗

5。A seismograph records oscillation of the ground caused by seismic waves, vibrations that travel from its point of origin through the Earth or along its surface.

d

是宾语同位语吧,可以在最后面的

第一题选the one,有those,that,the one优先选,因为这些都是泛指而it,them都是特指