题目内容

Whether or not there is life in outer space is anenigma.We may never know for sure until we are capable of space travel or aliens actually land on our planet.Enigmameans

A. reason.
B. certainty.
C. mystery.

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Suicide rates tend tofluctuatewith the seasons, with much higher rates in the winter than in the summer.Fluctuatemeans

A. go up and down.
B. disappear.
C. stay the same.

Human beings are resilient creatures—they can often bounce back from negative experiences and adjust well to life.Resilient means

A. not flexible.
B. living.
C. able to recover.

A major accomplishment of sociology is dispelling the myths and prejudices that groups of people have about each other.Dispelling means

A. ignoring.
B. making vanish.
C. creating again.

Ten years of research culminated in a report explaining the mysterious behavior of the praying mantis, a large green or brownish insect.Culminated means

A. failed.
B. began.
C. concluded.