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Decide whether this statement is true or false according to Text A of Unit 4. 7. So far, a gastric bypass surgery is the most effective treatment for substantial weight-loss for obese people.

Decide whether this statement is true or false according to Text A of Unit 4. 7. So far, a gastric bypass surgery is the most effective treatment for substantial weight-loss for obese people.
A.正确
B.错误
正确答案:正确