19. A　参见上题解析。decision“决定”；promise“诺言”；idea“主意”；duty“职责”。

　　20. C　我们在一起两年了，我从未跟她吵过架，即使在纸上也从来没有过，我永远不会和她吵架。even“甚至”，用于加强语气。yet“还”；also“也”；still“仍然”。

　　.阅读理解

　　Nuclear radiation from power plant leaks and bomb tests resulted in millions fewer baby girls born worldwide, according to a new study.

　　Scientists noted these types of atmospheric blasts rather than on­the­ground incidents like Chernobyl(切尔诺贝利), affected birth gender across the globe.

　　Scientists at Helmholtz Zentrum München, Germany, analysed population data from 1975 to 2007 for the U．S. and 39 European countries.

　　There was an increase in the number of baby boys relative to girls in all of the countries from 1964 to 1975. This was the case in many Eastern European countries for several years after 1986.

　　Scientists are putting the first spike down to the atomic bomb tests of the 1960s and 1970s where radioactive atoms were blasted into the atmosphere. Air currents caught these atoms and then distributed them around the world.

　　They think the second spike is due to the 1986 Chernobyl disaster in which the reactor exploded in Ukraine(乌克兰)．

　　The effects of Chernobyl were felt locally and no effect was seen in the U．S., probably because it was too far from the disaster to have an effect.

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