17　根據(jù)先行詞來(lái)判斷介詞　Track17

 

所選用的介詞與先行詞構(gòu)成固定搭配。比如：at the rate，in the direction，to the extent，to the degree，at the temperature，with ease，by the means等。
先看兩個(gè)簡(jiǎn)單句：
About a thousand species of animals are in danger of extinction. They are being destroyed at this rate and the rate has increased.
約有1,000種動(dòng)物瀕臨滅絕。它們目前正在 以這樣的速度 遭到殘害，而且 這個(gè)速度 還在加快。
我們現(xiàn)在要明確說是什么速度在增加：the rate（接定語(yǔ)） has increased，所以用they are being destroyed at this rate 作定語(yǔ)修飾the rate。我們便得到：
The rate (they are being destroyed at which ) has increased.
連詞要放在從句開頭，所以變?yōu)椋?br /> The rate ( at which they are being destroyed) has increased.
最后，我們得出一個(gè)標(biāo)準(zhǔn)的定語(yǔ)從句，如下：
a.About a thousand species of animals are in danger of extinction, and the rate at which they are being destroyed has increased.
約有1,000種動(dòng)物瀕臨滅絕，而且遭到殘害的速度日益加劇。
以下更多例句，請(qǐng)認(rèn)真分析：
b.When television was first introduced, the extent to which it would affect society could not have been foreseen.
最早發(fā)明電視的時(shí)候，人們并沒有預(yù)見到它會(huì)對(duì)人類社會(huì)產(chǎn)生重大影響。
c.It is useful to be able to predict the extent_________which a price change will affect supply and demand.
A. from
B. with
C. to
D. for
正確答案：C。
d.It is the way we understand the world and the means by which we shape it.
這就是我們理解這個(gè)世界的方式，同時(shí)也是我們塑造它的手段。
e. The speed at which an animal lives is determined by measuring the rate at which it uses oxygen.
通過測(cè)定動(dòng)物消耗氧氣的速率可以確定該動(dòng)物的生長(zhǎng)速度。
f.Americans regard education as the means by which the inequalities among individuals are to be erased and by which every desirable end is to be achieved.
美國(guó)人認(rèn)為，教育可以消除群體中存在的不公，實(shí)現(xiàn)個(gè)人的理想。
g.A frequent criticism of most online companies has been the snail's pace at which they deliver their products.
人們對(duì)大多數(shù)網(wǎng)絡(luò)公司的怨言是他們?nèi)缥伵Ｅ佬幸话愕乃拓浰俣取?br /> h.The pressure from spending in turn determines the ease with which prices increase.　來(lái)自消費(fèi)的壓力轉(zhuǎn)而又決定了價(jià)格上漲的快慢。
i.The ease_________the fish can be collected from the shore has almost resulted in its extinction.
A. which
B. with what
C. with which
D. with that
正確答案：C。
j.By bringing about a great leap in the speed and ease with which information moves from place to place, the Internet has greatly accelerated the rate of scientific and technological changes.
互聯(lián)網(wǎng)使信息傳遞更快捷、方便，由此大大加速了科技變革的進(jìn)程。