D. One's fast heartbeats are likely to cause fear.

　　48．The study was carried out by analyzing

　　________.

　　A. volunteers' heartbeats when they saw terrible pictures

　　B. the time volunteers saw fearful pictures and their health conditions

　　C. volunteers' reactions to horrible pictures and data from their brain scans

　　D. different pictures shown to volunteers and their heart－brain communication

　　49．Which of the following is closest in meaning to “mechanism” in Paragraph 6?

　　A. Order.

　　B. System.

　　C. Machine.

　　D. Treatment.

　　50．This study may contribute to

　　________．

　　A. treating anxiety and stress better

　　B. explaining the cycle of fear and anxiety

　　C. finding the key to the heart－brain communication

　　D. understanding different fears in our hearts and heads

　　2017·天津卷] B

　　B

　　Last night's meteor(流星)shower left many people in the community dissatisfied and demanding answers.According to Gabe Rothschild, Emerald Valley's mayor, people gathered in the suburbs of the city, carrying heavy telescopes, expecting to watch the brightly burning meteors passing through the sky.What they found instead was a sky so brightened by the city's lights that it darkened the light of the meteors passing overhead.

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