D. why we yawn when we see someone else stay up late

　　2. The underlined word“triggered”in the third paragraph probably means“　”.　

　　A. set off B. cut off　C. built up D. broken up

　　3. We can learn from the passage that mirror neurons　.　

　　A. relate to human behavior and interaction

　　B. control human physical actions and feelings

　　C. result in bad behavior and social disorders

　　D. determine our knowledge and language abilities

　　4. What is the passage mainly about?

　　A. Ways to find mirror neurons.　 B. Problems of mirror neurons.

　　C. Existence of mirror neurons.　 D. Functions of mirror neurons.

　　【参考答案】1—4、CAAD

　　阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。Firefighters had largely tamed a tower of flame and smoke that covered the sun and drove thousands from their homes in the foothill suburbs northeast of Los Angeles, but a week of dangerously windy wildfire conditions and a year of historic dryness meant that this fire and predictable ones to come remained a major threat.

　　By nightfall Thursday, the wildfire that swept through about 2 1/2 square miles of brush in the San Gabriel Mountains and destroyed five homes early in the day had its progress stopped and was 30 percent contained. More than 700 firefighters were on the scene, along with 70 engines and a fleet of helicopters and air tankers dropping water and retardant(阻止物).

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