文档介绍：Unit 2
In times of economic_______, people have to tighten their belt and live a thrifty life.
threat B. crisis C. risk D. hazard
Our soldiers force the enemy to ______with superior firepower.
retrieve B. reflect C. retreat D. retrospect
He is a strong-minded person who can undertake heavy tasks at the _____ moment. 
crude B. cruel C. crucial D. crunch
This scandal is ______ to tell against him in ing presidential election.
bound B. doomed C. predestined D. foretold
 Because koalas are ______ animals, their prices are fairly expensive.
abnormal B. weird C. freak D. exotic
I chanced to _____ them speaking ill of you.
overhear B. overhead C. overlook D. overwhelm
______ is an important constituent of good character.
Timing B. Punctuality C. Procrastination D. Fickleness
______ your papers and put them in this file.
Assemble B. Assess C. Assume D. Assure
 whole winter the swallow remained underground, and Timmy ______ her with care and love.
cared B. attended C. bred D. nursed
 passions, simple but overwhelmingly strong,have governed my life:the ______ for love,the search for knowledge, and unbearable pity for the suffering of mankind
expectation B. pursuit C. longing D. exploration
 ______ from the large crowd that the speaker is very popular.
deduce B. seduce C. reduce D. induce
's rude to ______ at a foreign student's mistakes in English.
humiliate B. tease C. mock D. provoke
 was still totally______ in the romantic scene as if it were occurring that moment. 
upied B. focused C. immersed D. devoted
TV station was ______ plaints against a tasteless TV program.
bombarded C. attacked C. jammed D. criticized
 current laws, those who ______ someone to end their own life can be prosecuted and jailed for up to 14 years.
persuade B. convince C. coax D. abet
Key: 1-5 BCCAD 6-10 ABADC 11-15 ACCAD

Unit 4
The polluted water can be ______ if swallowed. Police are investigating what caused the p