2014高考英语完形填空限时训练极品题（23）及答案
【深圳市2014高考英语综合能力测试题（6）】
完形填空（共1 5小题；每小题2分，满分30分）
阅读下面短文，掌握其大意，然后从1-15各题所给的A、B、C和D项中，选出最佳选项。
If they kick the habit of smoking, some smokers over 65 years old may reduce their risk of dying from heart-related problems to the level of nonsmokers, according to new research presented on Wednesday.
Many people in the study lowered the risk of developing heart failure, or the risk of 1 from heart failure, heart attacks and strokes to the same 2 as the non-smokers in nearly half the time as previous research had in dicated.
"For half of them, it was eight years after quitting," said Professor Ahmed. "Even for the 3 smokers, who smoked more than 32 pack years, compared to current smokers, they will 4 reduce the risk of mortality(死亡率) by 35 percent by quitting, so there's a positive 5 for everybody."
"Cutting the 6 to the level of non-smokers was much more difficult in comparison with 7 smokers," he added. .
Researchers 8 their data by analyzing 13 years of medical information from a health study. They compared 853 people who 9 smoking 15 or fewer years ago with 2,557 people
