（Over the last few years, the number of Kravonians enrolled in college has been growing steadily. ）表示过去几年里注册的学生数增加，但这并不代表每年比去年招了更多人，可能是每年都只招1000人，但由于B选项里的（The average number of years Kravonian college students remain enrolled before completing a degree has been increasing over the past several years.）这个原因，导致很早注册的那群人还没毕业，所以即便每年一千一千的新学生入学，这群Kravonians enrolled in college（可以理解为一个pool）也就越来越多，但是，最终当年毕业的人数却没增加，导致题干中的结论不成立。
Not a problem of amount (op. D), rather than a contextual consideration in a wholesome view (op.E), cause "the GDP is almost always higher than ever before" 很多限定词，语义精确，态度强烈。
句子主干：researchers have discovered a scrub jay can remember ...and tends not to...
tend后面的意思是，如果一个食物储存时间长容易腐烂，它也不会去寻找
a,主胃不一致，a scrub是单数，应该用tends. if引导的从句没有主语
b,they指代对象有误
c, tending在and前找不到平行对象
d, stored作为treat的定语
e, tend to do sth.
扫描二维码，直接登录
raised by $0.5, 不是增长百分之五。