扫描二维码，直接登录
题库 / GMATAdvanced-CR-40
First discovered several years ago in North American lakes and rivers, the northern snakehead is a nonnative fish with no local predators. To keep the northern snakehead ’s population from growing, for the past three years wildlife officials have been paying recreational fishers for each northern snakehead they catch. In this way, the officials hope to stop the northern snakeheads from eliminating rare native fish species.
To evaluate the likelihood that the wildlife officials’ plan will succeed, it would be most useful to determine which of the following?
Whether the northern snakehead’s population in local lakes and rivers could be reduced by introducing predators from its native habitat
How local population numbers of rare native fish species have been changing since the wildlife officials started paying recreational fishers to catch northern snakeheads
Whether the fish species on which the northern snakehead preys in regions to which it is native and in which it is abundant have become significantly depleted in recent decades
What total number of northern snakehead have been caught by recreational fishers since the wildlife officials began paying for them
Whether rare native fish species in the region face any threats to their survival other than the proliferation of northern snakehead
D，单知道被抓的鱼的数量不知道被抓的鱼的数量占总量的比例也是没有滴，比如抓了1万条，但是总共可能有1亿条，杯水车薪，该被鱼吃光的还是会被吃光。
B，stop sb from doing sth阻止某人做某事，可以看成是已经做了，现在要他stop，说明黑鱼的存在已经威胁到了稀有的当地鱼的数量，所以黑鱼如果少了，稀有鱼的数量就会上升，而不是因为是稀有鱼，所以数量该稀少还是稀少。
登录 或 注册 后可以参加讨论