45. What is the conclusion of the study?

• A、Apple consumption has greatly reduced US adults' trips to the doctor.

• B、An apple a day does keep the doctor away.

• C、Apples are far more nutritious than oranges.

• D、A small number of US adult apple eaters tend to take less medicine.

49. According to Bryk and Schneider, what was most important for successful school improvemt?

• A、New standards and tests in schools.     

• B、Positive social relationships.

• C、Strict teacher and student evaluations.

• D、Assistance of the government.

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