课时作业39
ⅰ.完形填空
(2013•河南模拟)overweight has been a great concern for many people.in an attempt to keep normal weight，people have __1__ tried various methods.nevertheless，not all the ways are __2__ when it comes to health.for weight loss，many people __3__ the highprotein，lowcarbohydrate (碳水化合物) diets.however，such diets might have __4__ longterm effects on the colon (结肠)．the diets can also create certain __5__ in the colon that could lead to colon cancer risk.at least it can raise the __6__ of the risk
