19. 答案

　　A

　　解析

　　根据下文人们对现代技术的态度可知，态度在不同的时期会有所变化。vary意为“变化；改变”，符合语境。

　　20. 答案

　　D

　　解析

　　如果没有每日的技术进步，很难想象生活会是什么样子。根据宾语从句中所用虚拟语气可知，条件从句表示否定意义，without符合语境。

　　Ⅱ.阅读理解

　　A blood test that can predict whether someone may attempt suicide has been developed by scientists in a breakthrough which could prevent hundreds of deaths.

　　American researchers have found that variations in a single gene can be used to predict if someone is likely to take his own life. Researchers at John Hopkins University, in Baltimore, Maryland, found that the gene SKA2 stopped functioning correctly in people at risk of suicide. The SKA2 gene is found in the prefrontal cortex(前额皮层) of the brain, and is involved in preventing negative thoughts and controlling abnormal behavior. If there isn’t enough SKA2, or it is changed in some way, the body cannot control levels of cortisol (皮质醇). Previous research has shown that people who attempt suicide or who take their own lives have large amounts of cortisol in their systems. A test could allow doctors or psychologists to place patients on 搒uicide watch?and disableol their access to drugs or equipment which they could use to end their own life.

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