Recognizing the Main Idea: Answer Key

Exercise 1

1.b; 2.b

Exercise 2

1. Across the country, many states have abolished the policy of "social promotion," even though there is no hard evidence that making children repeat a grade has a positive effect.

2. In 1932, Wallace H. Carothers developed nylon, the first synthetic fiber, which had a dramatic effect on world events.

Exercise 3

1. No nicknames for soldiers of previous generations have earned the popularity of the term GI.

2. Since her death, Frida Kahlo’s reputation has overtaken her husband’s.

Exercise 4

1. King Leopold of Belgium exploited the Congo for personal gain and all but ruined the country.

2. The invention of the CAT scan was as important a discovery as the development of X-Rays.

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