B. related to inherited and genes

　　C. not inherited and genetically determined

　　D. related to inherited and upbringing

　　3. Even small changes people make in their lives ________ their emotional energy.

　　A. cannot help control

　　B. cannot help increase

　　C. can help control

　　D. can help increase

　　4. Ivy filled her life with meaning by launching a program to ________.

　　A. help herself

　　B. teach herself

　　C. teach poor children

　　D. help poor children

　　5. The real-estate broker the author knows enjoyed ________.

　　A. redecorating the houses

　　B. mentally redecorating the houses

　　C. the same day-to-day work

　　D. defining fun differently

　　【参考答案】1—5、BCDDB

　　阅读理解

　　Recognized as the largest desert in the world, the Sahara runs across North Africa, Covering over 3 million square miles from the Atlantic Coast to the Nile River Valley. Except for an occasional oasis(绿洲), this vast land is mainly made up of sand, stones, and worn out mountains. The burning sun causes daytime temperatures to rise to 70 degrees in the shade, and days without rain commonly last for years.

　　Paintings found on the walls of caves in the Sahara Desert suggest that a few thousand years ago, large quantities of plants grew there and covered the desert floor. Many curious and unusual insects, birds and animals got enough food that allowed them to grow and reproduce. At that time, huge river systems and many oases supported growing communities(社团，社区) where a large number of people lived.

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