profitable

填 B advantageous 有益于,有利于
A profitable 通常用在金钱,商议伤得词汇,就像利润这类东西,比如 The business is very profitable.况且 profitable 通常句式是 profitable for sb/sth
所以虽然填profitable 不算是错,但 advantageous 会是个更好的选择.

设玉米产量为x,大米产量为y,则最大收益为65x+40y, 再把四个值依次代入,得当x=50,y=80时有最大收益,上信息课的时候做的,还被老师发现了,给分吧!

如果要不违反“句子重心”问题,前提条件是原句是个正确的句子呀.
选项A本身（即原句）就是一个错误的句子,不能构成主从结构,因为which在句中指代 the profitable credit card subsidiary,把定语从句单独拎出来就是：it(指the company) plans to use money from the profitable credit card subsidiary是不通的,而正确的理解是use money from selling its profitable credit card subsidiary,但是sell...是个动词词组,而which只能指代名词词组,故这个句子是错误的,只有改成use money from that sale才正确.
因此,不得不将原本是主从结构的句子变成了并列句.
希望能看懂解释,供参考.

先看区别
a 给你带来利润的
b 大量的
c 能够重复的
d 很值钱的
所以,一看就知道正确答案是 b
另外,some是笔误,应该改成sum

损益表显示的是一个公司在此表所涵盖的时期内的盈利情况

49---52 DDBC

略

话说五百年前。。。。

尽管卖担保目前非常有利润,有些零售商甚至认为他们利润的3/4都来自这种收入,但卖担保仍然招致批评,因为在很多不太可能发生的索赔情景之下,模糊的条款会限制赔付,也就提供不了什么金钱价值.
warranty salesy应该是指类似于延保服务,或者在生产商标配之外,由零售商来提供的保障,类似保险之类,估计文章的意思是这种服务大都用不上,因此商家也就赚了.
主语是they,主干是they are criticized
with some retailers...to this income stream,是解释highly profitable
which 引导的从句,修饰obscure clauses.many,but the most unlikey 修饰claim

一个有高投资回报率的可盈利广告文案用绿色的高显条突出显示.非盈利的则用灰色的投资回报率条突出显示.
投资回报率计算方法如下：
投资回报率＝（看的天数＊看的百分比）/自上次观看以后观看的天数
例如：一个关键词为"送花..."的广告文案在20天里被看了15天；该广告文案是两天前被看到的.
看的天数:15
看的百分比:15/20= 75%
自上次观看以后观看的天数:2 天
投资回报率 = (15*75%)/2 = 5.6
注：有些地方我翻的不是太懂,是照原文意思译过来的－－句子是懂的,专业的内容意义不太明白.

人寿保险是一项非常有利可图的业务.

was being taken ove

profitable [英]ˈprɒfɪtəbl [美]ˈprɑ:fɪtəbl
adj. 有利可图的,有益的;可赚钱的,合算的
[例句]But with supply outstripping demand , companies have to identify the most profitable customers.
但最近情况却发生了变化,随着供给超过需求,企业必须找出最有利可图的客户群.

Praise is like sunlight to the human spirit; we cannot flower and grow without it.And yet,while most of us are only too ready to apply to others the cold wind of criticism,we are somehow reluctant to give our fellows the warm sunshine of praise.
Why - when one word can bring such pleasure?A friend of mine who travels widely always tries to learn a little of the language of any place she visits.She's not much of a linguist,but she does know how to say one word - "beautiful" - in several languages.She can use it to a mother holding her baby,or to lonely salesman fishing out pictures of his family.The ability has earned her friends all over the world.
It's strange how chary we are about praising.Perhaps it's because few of us know how to accept compliments gracefully.Instead,we are embarrassed and shrug off the words we are really so glad to hear.Because of this defensive reaction,direct compliments are surprisingly difficult to give.That is why some of the most valued pats on the back are those which come to us indirectly,in a letter or passed on by a friend.When one thinks of the speed with which spiteful remarks are conveyed,it seems a pity that there isn't more effort to relay pleasing and flattering comments.
It's especially rewarding to give praise in areas in which effort generally goes unnoticed or unmentioned.An artist gets complimented for a glorious picture,a cook for a perfect meal.But do you ever tell you laundry manager how pleased you are when the shirts are done just right?Do you ever praise your paper boy for getting the paper to you on time 365 days a year?
Praise is particularly appreciated by those doing routine jobs:gas-station attendants,waitresses - even housewives.Do you ever go into a house and say,"What a tidy room"?Hardly anybody does.That's why housework is considered such a dreary grind.Comment is often made about activities which are relatively easy and satisfying,like arranging flowers; but not about jobs which are hard and dirty,like scrubbing floors.Shakespeare said,"Our praises are our wages." Since so often praise is the only wage a housewife receives,surely she of all people should get her measure.
Mothers know instinctively that for children an ounce of praise is worth a pound of scolding.Still,we're not always as perceptive as we might be about applying the rule.One day I was criticizing my children for squabbling."Can you never play peacefully?" I shouted.Susanna looked at me quizzically."Of course we can," she said."But you don't notice us when we do."
Teachers agree about the value of praise.One teacher writes that instead of drowning students' compositions in critical red ink,the teacher will get far more constructive results by finding one or two things which have been done better than last time,and commenting favorably on them."I believe that a student knows when he has handed in something above his usual standard," writes the teacher,"and that he waits hungrily for a brief comment in the margin to show him that the teacher is aware of it,too."
Behavioral scientists have done countless experiments to prove that any human being tends to repeat an act which has been immediately followed by a pleasant result.In one such experiment,a number of schoolchildren were divided into three groups and given arithmetic tests daily for five days.One group was consistently praised for its previous performance; another group was criticized; the third was ignored.
Not surprisingly,those who were praised improved dramatically.Those who were criticized improved also,bus not so much.And the scores of the children who were ignored hardly improved at all.Interestingly the brightest children were helped just as much by criticism as by praise,but the less able children reacted badly to criticism,needed praise the most.Yet the latter are the very youngsters who,in most schools,fail to get the pat on the back.
To give praise costs the giver nothing but a moment's thought and a moment's effort - perhaps a quick phone call to pass on a compliment,or five minutes spent writing an appreciative letter.It is such a small investment - and yet consider the results it may produce."I can live for two months on a good compliment," said Mark Twain.
So,let's be alert to the small excellences around us - and comment on them.We will not only bring joy into other people's lives,but also,very often,added happiness into out own.