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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.

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16. Moviegoers know that many special effects are created by computers,         they often don' tknow is that these scenes still require a lot of work.

• A、That 

• B、 Whom
  

• C、 What

• D、How