11.Europe's earlier industrial growth was _____ by the availability of key resources,abundant and cheap labor,coal,iron ore,etc.

　　A)constrained

　　B)remained

　　C)sustained

　　D)detained

　　12.We've just installed a fan to _____ cooking smells from the kitchen.

　　A)eject

　　B)expel

　　C)exclude

　　D)exile

　　13.We work to make money,but it's a _____ that people who work hard and long often do not make the most money.

　　A)dilemma

　　B)conflict

　　C)prejudice

　　D)paradox

　　14.Very few people could understand the lecture the professor delivered because its subject was very _____.

　　A)intriguing

　　B)indefinite

　　C)obscure

　　D)dubious

　　15.I had eaten Chinese food often,but I could not have imagined how _____ and extravagant a real Chinese banquet could be.

　　A)fabulous

　　B)gracious

　　C)handsome

　　D)prominent

　　16.Because of the _____ noise of traffic I couldn't get to sleep last night.

　　A)progessive

　　B)provocative

　　C)perpetual

　　D)prevalent

　　17.If you go to the park every day in the morning, you will _____ find him doing physical exercise there.

　　A) logically

　　B) ordinarily

　　C) invariably

　　D) persistently

　　18.Althougn she's an _____ talented dancer,she still practices several hours every day.

　　A) rationally

　　B) additionally

　　C) traditionally

　　D) exceptionally

　　19.The idea is to _____ the frequent incidents of collision to test the strength of the windshields.

　　A) simulate

　　B) accumulate

　　C) forge

　　D) assemble

　　20.I told him that I would _____ him to act for me while I was away from office.

　　A) identify

　　B) authorize

　　C) rationalize

　　D) justify