18．A.As

　　B．Unless

　　C．Though

　　D．Until

　　解析：选C。虽然(though)作者不知道自己为什么拥有这样的容貌，但是她知道为什么她能成为今天的自己。

　　19．A.happiest

　　B．best

　　C．prettiest

　　D．wisest

　　解析：选B。作者认为自己的养母是最好的(the best)母亲。

　　20．A.saved

　　B．regretted

　　C．shaped

　　D．declared

　　解析：选C。动词shape 表示“塑造”，这里指养母对作者的悉心养育和一贯影响塑造了如今的她。上文“...had made me who I am today”也有提示。

　　Ⅱ.阅读理解

　　A

　　Words：329　难度系数：★★★　建议用时：8分钟

　　A scientist turns out to be able to see the future by offering each of some four-year-olds a piece of candy and watching how he or she deals with it.Some children reach eagerly for the treat they see.Some last a few minutes before they give in.But others are determined to wait until the last moment.

　　By the time the children reach high school，something remarkable has happened.A survey found that those who as four-year-olds had enough self-control to hold out generally grew up to be more popular，adventurous，confident and dependable.The children who gave in to temptation(诱惑) early on were more likely to be lonely，easily frustrated(沮丧)and inflexible(固守己见的)．

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