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　　One big challenge with placebo responses is that they are _____: people given the same inert pill or potion may show wildly different reactions, and the effects can vary widely according to each person’s illness.

　　A：capricious

　　B：illusory

　　C：unpredictable

　　D：chimerical

　　E：marginal

　　F：ephemeral

　　答案：AC

　　Although his original mission was a failure, Russian botanist Michael Friedrich Adams achieved an unexpected _____ when he found, by chance, the carcass of a woolly mammoth.

　　A：conclusion

　　B：upheaval

　　C：triumph

　　D：bombshell

　　E：success

　　F：venture

　　答案：CE

　　The Chicago journal known as Poetry has been the launching pad for many poets since its _____ in 1913; among them, T. S. Eliot, Gwendolyn Brooks, and John Ashbery.

　　A：extraction

　　B：foundation

　　C：partnership

　　D：employment

　　E：revival

　　F：inception

　　答案：BF

　　The phrase “bread and circuses” refers to early Roman politicians’ plans to _____ the votes of the poor by handing out cheap food and entertainment.

　　A：belie

　　B：surmount

　　C：secure

　　D：control

　　E：cherish

　　F：earn

　　答案：CF

　　Although most land snails are _____, the giant African snail is a notable exception; it can be 15 inches long and weigh 2 pounds.

　　A：gargantuan

　　B：juvenile

　　C：functional

　　D：diminutive

　　E：responsive

　　F：minuscule

　　答案：DF

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