听力原文：If it tastes good, it must be bad, so the saying goes. But delicious dark chocolate may be the exception to the rule. It may help lower blood pressure by an average of 10%.

(83)

It is advocated that you should understand the situations before you make______.

Before getting a new job, people should think about ______.

According to __ made on Dec. 15, 1915, every person entering or leaving the United States is required to have a valid passport.

Part B

Look at the pictures below and write an essay about 120 words, making reference to the following points:

1) a description of the pictures

2) your comments on this phenomenon

What makes the author and other people believe that "in some ways the plight and behavior. of teenagers have indeed deteriorated"？ (para. 4)