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2 CHECK. Correct the error in each sentence to make it true according to the article from
exercise 1 on page 131.

ypcentenarians
1. Ina study of over 1000 75-yearolds, researchers have discovered a set of “long-life” genes.

2. Long-life genes may cause the typical diseases of the elderly.

3. Lifestyle, the environment, and plain good luck have little effect on life span.

4. Scientists are learning how to destroy genes to help predict certain illnesses.

5. Dan Buettner believes that scientists may even learn how to stop the aging process.

DISCOVER. Complete the exercises to learn about the grammar in this lesson.

A_ Look at the underlined subjects in the sentences. Circle the verb or verb phrase that agrees
with each subject.

1. The authors of the study ¢hinb\that long-life genes may affect aging.

2. Every person with long-life genes is not going to live to be a hundred.

3. A number of other important factors greatly influence life span.

4. In fact, 23 percent of the people in the study were not individuals with long-life genes.

5. Years of research have taught him several things.

132 NOUNS, ARTICLES, AND SUBJECT-VERB AGREEMENT
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