The prairie vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles.
Which of the following, if true, provides the strongest support for the explanation offered?
Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendants, popularly known as killer bees, had migrated as far north as southern Texas.
A Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, B In less than 35 years since releasing African honeybees outside Sao Paulo, Brazil, C In less than the 35 years since African honeybees had been released outside Sao Paulo, Brazil, D It took less than 35 years from the release of African honeybees outside Sao Paulo, Brazil, when E It took less than the 35 years after the time that African honeybees were released outside Sao Paulo, Brazil, and then
DE首先排除,it took 让句子显得wordy。A月BC的区别在于有无In与该是after还是since。开始误选了B因为没有仔细思考after与since的区别。韦氏词典中after是following in time or place,表在这之后的一个时间点如何了,而since是from a definite past time until now表自那以来 强调持续一个状态一直怎样。如韦氏词典中关于since的例句是She graduated four years ago and has since married.强调从那以后一直保持married的状态。而迁移到Texas显然不是自从释放后一直保持的一个状态。因此after比since更确切。所以正确答案应该选A.
The prairie vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles.
Which of the following, if true, provides the strongest support for the explanation offered?
A It is in the spring and early summer that prairie vole communities generally contain the highest proportion of young voles. B Prairie vole populations vary dramatically in size from year to year. C The prairie vole subsists primarily on broad-leaved plants that are abundant only in spring. D Winters in the prairie voles' habitat are often harsh, with temperatures that drop well below freezing. E Snakes, a major predator of young prairie voles, are active only from spring through early autumn.
选项要支持解释,则一定要与解释相关。解释是a seasonal variation in mortality among young voles。则选项一定要与young voles有关,只剩A与E A时间范围不对,是spring and early summer不符。E from spring through early autumn相关 选E
The list of animals that exhibits a preference of either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include the lower vertebrates.
A exhibits a preference of either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include B exhibits the preference to use either the right or the left hand (i.e., claw, paw, or foot) has been expanded and includes C exhibit a preference in either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include D exhibit a preference for using either the right or the left hand (i.e., claw, paw, or foot) has been expanded to include E exhibit the preference as to either using the right or the left hand (i.e., claw, paw, or foot) has been expanded and includes
Unlike most severance packages, which require workers to stay until the last day scheduled to collect, workers at the automobile company are eligible for its severance package even if they find a new job before they are terminated.
A the last day scheduled to collect, workers at the automobile company are eligible for its severance package B the last day they are scheduled to collect, workers are eligible for the automobile company's severance package C their last scheduled day to collect, the automobile company offers its severance package to workers D their last scheduled day in order to collect, the automobile company's severance package is available to workers E the last day that they are scheduled to collect, the automobile company's severance package is available to workers