Reading简化题求助!TPO4Reading求助!：The causes of this population re

Reading简化题求助!
TPO4Reading求助!：The causes of this population rebound are consequences of other human actions. First, the major predators of deer—wolves, cougar, and lynx—have been greatly reduced in numbers. Second, conservation has been insured by limiting times for and types of hunting. But the most profound reason for the restoration of high population numbers has been the fate of the forests. Great tracts of lowland country deforested by logging, fire, or both have become ideal feeding grounds for deer. 【In addition to finding an increase of suitable browse, like huckleberry and vine maple, Arthur Einarsen, longtime game biologist in the Pacific Northwest, found quality of browse in the open areas to be substantially more nutritive.】 The protein content of shade-grown vegetation, for example, was much lower than that for plants grown in clearings.第11题为什么选B不选D,我就这两个答案弄不明白,11题文本如上,题目就没打了...