16)The grain of rye is longer [A] and slenderer [B] than [C] those of [D] wheat.

　　解析：D错。改为that.这里比较的“The grain”不是复数，不能用复数代词those.

　　17)The activities of the international marketing researcher are frequently much broader than .

　　[A] the domestic marketer has [B] the domestic marketer does

　　[C] those of the domestic marketer [D] that which has the domestic marketer

　　解析：C为正确答案。比较句中，连词than前后，即所比较的成分要一致，应该在同种事物间进行比较。本句所比较的是两种 activities ，故C正确，代词those 代替“the activities”。

　　18)The grape is cultivated plants.

　　[A] one of the oldest [B] the oldest one

　　[C] one which the oldest [D] the one is the oldest of

　　解析：A对。“one of the oldest…”表示“(历史)最长的栽种植物之一”，C和D均不合语法，而B选项中的one多余。

　　19) ，William Shakespeare is the most widely known.

　　[A] With all writers in English

　　[B] All writers in English

　　[C] All of the writers in English

　　[D] Of all writers in English

　　解析：D为正确答案。

　　20)The crane is of the wading birds.

　　[A] the tallest

　　[B] the tallest that is

　　[C] which is the tallest

　　[D] which the tallest is

　　解析：A为正确答案。

　　21)The Appalachians Trail，extending [A] approximately 2，020 miles [B] from Maine to Georgia，is the longer [C] continuous [D] marked footpath in the world.

　　解析：C错。只有在两者相比较时才使用比较级，而本句出现了状语in the world，明显表示不止两者相比，故应改用最高级(the)longest .

　　22)La Paz，Bolivia is the higher [A] capital city in [B] the western hemisphere and [C] the second highest [D] in the world.

　　解析：A错。改为the highest.

　　23)The best way to control rats is by seeing that they have as .

　　[A] possibly little nourishment [B] nourishment possibly little

　　[C] little as possible nourishment [D] little nourishment as possible

　　解析：D 为正确答案，“as little nourishment as possible ”意为“尽可能少的养料”。

　　24)Earlier [A] or later，all lakes are influenced [B] by eutrophication，a process in which lake sediment(沉积物)lowers the depth [C] of the water and drains(除去)oxygen from it [D] .

　　解析：A错。改为sooner.

　　25)Alexander Graham Bell once told his family that he would rather be remembered as a teacher of the deaf of the telephone.

　　[A] than inventing [B] than as the inventor

　　[C] the invention [D] as the inventor

　　解析：B为正确答案，两个短语“as a teacher of the deaf”和“ as the inventor of the telephone”相比。

　　26)Wool is characteristic on which to classify breeds of sheep.

　　[A] most obviously

　　[B] obvious the most

　　[C] the most obvious

　　[D] the most obvious that is

　　解析：C为正确答案。注意：空档后的“characteristic”是名词而不是形容词，所以不能填A。

　　27)The Democratic party has controlled [A] the most [B] of the elected positions at [C] state and local levels in South Carolina since [D] the Reconstruction.

　　解析：B错。改为most.

　　28)During [A] the seventeenth century the most [B] colonists were primarily concerned with [C] economics [D] and defense.

　　解析：B错。改为most.

　　29)Belgium，in the [A] 19th century，rapid [B] grew into [C] an industrial [D] country.

　　解析：A错。改为rapidly.

　　30)The Lost Colony in North Carolina mysterious [A] disappeared between [B] 1587 and 1590，when its [C] founder returned from a visit [D] to England.

　　解析：A错。改为mysteriously.

　　31)Many flatworms have of eyes .

　　[A] more pairs than one

　　[B] more than one pair

　　[C] one more pair than

　　[D] one pair more than

　　解析：B为正确答案。

　　32)Of the two houses the family prefers .

　　[A] the most isolated one

　　[B] the one isolated more

　　[C] the more isolated one

　　[D] the isolated one more

　　解析：C为正确答案。

　　33)Freezing is at present one of the of preserving meats and vegatables.

　　[A] most methods are important

　　[B] methods most important

　　[C] most important methods

　　[D] most are important methods

　　解析：C为正确答案。

　　34)The radio was of so [A] inferior quality that [B] I took it back [C] and asked for a better one [D] .

　　解析：A错。改为such.