单项选择题

Directions: In this section you will hear two mini-talks. At the end of each talk, there will be some questions. Both the talks and the questions will be read to you only once. After each question, there will be a pause. During the pause, you must choose the best answer from the four choices given by marking the corresponding letter with a single bar across the square brackets on your machine-scoring Answer Sheet.

A. Middle aged women had increased sleep problems.
B. Stress levels dropped sharply after people reached their fifties.
C. Being single affected the levels of happiness.
D. Sleep quality declined as people got older.