耗时:Questions 26 to 35 are based on the following passage.
Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the centre. You may not use any of the words in the bank more than once.
As if you needed another reason to hate the gym, it now turns out that exercise can exhaust not only your muscles, but also your eyes. Fear not, however, for coffee can perk them right up again. During 26 exercise, our muscles tire as they run out of fuel and build up waste products. Muscle performance can also be affected by a 27 called “central fatigue,” in which an imbalance in the body’s chemical messengers prevents the central nervous system from directing muscle movements 28 . It was not known, however, whether central fatigue might also affect motor systems not directly 29 in the exercise itself—such as those that move the eyes. To find out, researchers gave 11 volunteers a carbohydrate 30 either with a moderate dose of caffeine (咖啡因), which is known to stimulate the central nervous system—or as a placebo without, during 3 hours of 31 . After exercising, the scientists tested the cyclists with eye-tracking cameras to see how well their brains could still 32 their visual system. The team found that exercise reduced the speed of rapid eye movements by about 8%, 33 their ability to capture new visual information. The caffeine—the equivalent of two strong cups of coffee—was 34 to counteract this effect, with some cyclists even displaying 35 eye movement speeds, the team reports today in Scientific Reports. So it might be a good idea to get someone else to drive you home after that marathon.