Directions: In this section of the test, there are ten paragraphs. Each of the paragraphs is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Spell out the missing letters of the word on your Answer Sheet.
Paragraph Six
Driving for more than two hours a day negatively affects IQ levels, scientists have warned. In what might come as unwelcome news for middle-aged commuters, a recent study found that long periods behind the wheel could speed up the effects of age on the brain because the mind is less active on long car journeys.
Driving for a long t____ may dull your mind.
【正确答案】：time
