下面的短文有10處空白，每處空白后的括號內有一個詞，請根據短文內容將其正確的形式填入文中，以恢復文章原貌。Problems Caused by Using ComputersLong hours at the screen can cause 41 (ache) eyes, 42 (blur) vision and headaches, experts say. In fact, eyestrain surpasses even wrist pain as the top physical ___43__(complain) among heavy computer users. When peering into the computer screen, the eye's focusing muscle is at constant tension. Like any muscle, it feels sore when ____44___(overload) . And when someone spends a lot of time looking at something close, the eye muscle can get ____45___(stick) on the near-focus setting and have difficulty relaxing, leaving the person46(temporary) nearsighted, a condition called accommodative spasm(痙攣) that can last seconds or hours. The letters on the screen are not as clearly ____47___(define) as on a printed page. Take a magnifying glass to your monitor and you'll see the letters. each made up of pinpoint sources of light, have no sharp edges. But those liquid crystal display(LCD) monitors, like those found on laptop computers, are48 (easy) on the eyes be-cause they display sharper images. And studies have shown that when people are working on a computer, their rate of ____49___(blink) goes down by two-thirds, which can result in dry, stinging eyes. This is especially a problem for contact-lenses 50 (wear) .
Task 221. The machinery outside the calorimeters records everything________22. Nicola Waiters had time for the experiments________23. Volunteers have to get prepared for the time in the calorimeter________24. The experiments show that high-fat diets________25. It seems Nicola will continue________A. the volunteers doB. to support their further sessions of experimentC. because the life there can be very boringD. make people overeatE. because she was her own bossF. after passing a high-protein test
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