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【单选题】
内共生假说认为线粒体的祖先为一种：A.
革兰阴性菌
B.
革兰阳性菌
C.
绿藻
D.
褐藻
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【简答题】根据材料写作:随着人们环保意识的提高,绿色物流越来越得到重视。在物流组织安排中,我们需要考虑到运输工具的排放是否会产生污染问题,也需要考虑噪音、固体废弃物的污染。发展第三方物流能够实现简化配送环节、合理运输,可以避免自有物流带来的资金占用、运输效率低、城市污染加剧等问题。专业的物流企业使得在大城市的运输车量减少,从而缓解了物流对城市环境污染的压力。除此之外 , 物流企业还应采用环保的原料作动力,加...
【单选题】You must ______ to your sister for ____ so impolite. [ ]
A.
say sorry, is
B.
say sorry, being
C.
to say sorry, be
D.
saying sorry, to be
【单选题】good manners to say “Sorry” when you knock into someone but no need to say it again and again .
A.
There are ; there is
B.
It is ; there is
C.
There is ; it is
D.
It is ; it is
【简答题】光密介质中的场由入射波和（）叠加而成。
【单选题】－You must say sorry to Mary, Jack. －Why ________ I say sorry to her? It’s her who hurt me first.
A.
should
B.
would
C.
could
D.
might
【简答题】__________you are wrong, you should say sorry.
【单选题】--I'm sorry, but I don't quite follow you. Did you say you wanted to return on September 20? --Sorry, I__________myself clear. We want to return on October 20.
A.
hadn't made
B.
wouldn't make
C.
don't make
D.
haven't made
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