tend to do，to表方向，倾向
bother to do 和 bother doing ，费心/操心做某事

1. bother to do 和 bother doing 都是对的，不是考点
2. tend to do sth
3.and并列的是can和tends，主谓一致

a jay can tend to vs a jay tends to ，后者显然是更加合适的

bother doing和bother to do都ojbk

主语是a scrub jay，谓语动词用单数tends
错选了A，我觉得remember可以和tend平行，但是似乎hmmm没有can tend这种说法吧

treat，东西
it tends not to bother recovering a perishable treat stored long enough to have rotted.它往往不会费心回收一种易腐烂的食品，这种食品储存的时间太长，以致腐烂。
stored long enough to have rotted作定语，修饰treat，指食品具有被存储太久以致腐烂的性质，这里食品是不是被jay存储的无关紧要，别人存储的坏了它也不会想要。
bother doing,指在某事上费心，

1. bother to do 和 bother doing 都是对的；
2. tend to do sth。

if不是noun modifier，所以不可以修饰前面的perishable treat。
if从句省略了主语，省略的主语是主句主语Jay

tend to do sth.

A 主谓不一致 bother后to do表目的 语义不正确
B they 不能指代单数
C 无平行
D 正确 stored后置定语修饰treat
E tend to do it指代不清

Bother的固定搭配：
(not) bother to do something He didn\'t bother to answer the question.
not bother about/with He didn\'t bother with a reply.
(not) bother doing something Many young people didn\'t bother voting.

so, choice (a) (as well as (c) and (e)) implies that the bird itself is "stored long enough to have rotted" -- an interesting idea, but certainly not the intended meaning of the sentence.

there's also the problem with "if [participle]" -- a modifier that, by convention, refers to the SUBJECT of the sentence (not the proximate noun).
for instance:
Animal 1 will attack animal 2 if injected with enough of the hormones related to aggression.
--> in this sentence it is animal 1, not animal 2, that is being injected with hormones.

A scrub jay tends not to bother to recover a perishable treat if stored long enough to have rotted. if从句主语和主句一致，所以是这个鸟，所以语意错误。

选项分析：
A：主谓不一致。
B：代词they指代科学家，不合逻辑。
C：伴随状语表示是同时发生，不合逻辑。
E：it 没有refer。To do和doing都强调主语direct involved，其实都可以用在这里。

不过我这里疑惑的是bother后面为什么是加v-ing而不是to do
费心去做某一件事应该是bother to do sth.才是

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.

b选项they指代错误，排
and后应与（can） remember并列，用tend或者tends，c选项排
tend后面是否定，只能与can remember并列，不能与remember并列，主语为单数，a选项排
tend to do，e选项排

tends not to bother doing sth一项就把ABCE都秒杀了。。。

AB 错误因为主谓不一致
C错误因为and后面的成分无法和前面的clause平行
DE考的是外延和内涵，则tend是约束力比较强的词