81.The jeweler assured Mr. White that the stone was a(an)________ diamond and not an imitation.

　　A) graceful

　　B) genuine

　　C) actual

　　D) exact

　　82.The remarkable________ of life on the Galopagos Islands inspired Charles Darwin to establish his theory of evolution.

　　A) classification

　　B) diversion

　　C) density

　　D) variety

　　83.As the clouds drifted away an even higher peak became________ to the climbers.

　　A) obvious

　　B) visible

　　C) present

　　D) apparent

　　84.The news item about the fire is followed by a detailed report made________ .

　　A) on the spot

　　B) on the site

　　C) on the location

　　D) on the ground

　　85.The remarkable gains in the general health of the population in the world have been due in large measure________ the efforts of some great doctors.

　　A) for

　　B) with

　　C) by

　　D) to

　　86.He appeared in the court and supplied the facts________ to the case.

　　A) subject

　　B) attached

　　C) relevant

　　D) corresponding

　　87.In my opinion, you can widen the________ of these improvements through your active participation.

　　A) dimension

　　B) volume

　　C) magnitude

　　D) scope

　　88.John did not have to write the composition if he didn’t want to. It was________ .

　　A) imperative

　　B) optional

　　C) critical

　　D) unnecessary

　　89.I support your decision, but I should also make it clear that I am not going to be________ to it.

　　A) connected

　　B) fastened

　　C) bound

　　D) related

　　90.A________ exercise such as running is helpful to our health.

　　A) rigorous

　　B) vigorous

　　C) precious

　　D) continuous

　　91.If any man here does not agree with me, he should________ his own plan for improving the living conditions of these people.

　　A) put on

　　B) put out

　　C) put in

　　D) put forward

　　92.In sharp________ to John, who is frank, Henry is too sophisticated.

　　A) contrast

　　B) conflict

　　C) comparison

　　D) contradiction

　　93.On a small farm in a dry climate one should not grow crops that need________ space and a lot of water.

　　A) considerable

　　B) significant

　　C) extensive

　　D) quantitative

　　94.One reason for the successes of Asian immigrants in the U.S. is that they have taken great________ to educate their children.

　　A) efforts

　　B) pains

　　C) attempts

　　D) endeavours

　　95.She was pale with________ after working for three shifts in succession.

　　A) cold

　　B) fright

　　C) emotion

　　D) fatigue

　　96.What a________ person says or does today agrees with what he said or did yesterday.

　　A) harmonious

　　B) consistent

　　C) constant

　　D) sensible

　　97.What sort of________ can you get for the night in a city like this?

　　A) commission

　　B) treatment

　　C) accommodation

　　D) recommendation

　　98.As a defense against air-pollution damage, many plants and animals________ a substance to absorb harmful chemicals.

　　A) relieve

　　B) release

　　C) dismiss

　　D) discard

　　99.He________ his sorrow beneath a cheerful appearance.

　　A) concealed

　　B) retained

　　C) kept

　　D) shielded

　　100.As your instructor advised, you ought to spend your time on something________ researching.

　　A) worthwhile

　　B) worth

　　C) worthy

　　D) requesting