1.b; 2.b
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.
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.
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.