Exercise 3: Choose the underlined part in each sentence that needs correction. 1. Not as many children read books as a recreational activity than they used to. 2. The higher the plane flew, the least clearly we saw things on the ground. 3. The sequoia trees, some of which are more than 3,000 years old, are among the largest and old trees in the world. 4. In man, yellow-blue color blindness is less common as red-green color blindness. 5. California, with a population of more than 23 million, is the more populous state in America. 6. Some animals need more highlier developed sense cells than man to struggle for existence. 7. The yield of grain from an acre of corn is several times high as that from an acre of wheat. 8. The Empire State Building, though not as high, was elder than the World Trade Center in New York. 9. Even though Miss Colombia lost the beauty contest, she was still more prettier than the other girls in the pageant. 10. The area of the United States is divided into 50 states, of which the largest is Alaska and the most small is Rhode Island.