下列关于黄土高原的叙述，不正确的是[ ] A．黄土高原自西北向东南，黄土的颗粒越

充填后咀嚼时疼痛

A．意外露髓
B．充填体脱落
C．继发龋
D．乳牙内吸收
E．充填体过高

低密度脂蛋白中含量最多的载脂蛋白是（）

A.ApoAⅠ

B.ApoAⅡ

C.ApoB

D.ApoCⅡ

E.ApoE

简述视觉的二元学说。

If you want to know how crazy people can be about their pets, you might remember that Helmsley left $12 million to her little Maltese dog when she died last year.

The dog's name is Trouble. And apparendy Trouble is still alive. Of course, I would hang on,too, if someone left me $12 million. Look! Top-shelf dog food, soft pillows everywhere, drivers walking me in nice leafy parks. I would live to be 110 in dog years.

The dog's story is still fresh in my mind the other night when I leave a steak house after a superb meal. Then I notice a woman carrying a small bag out of the door behind me.

Once outside, she walks over to where a man is holding a tiny dog hke it's a baby. The dog looks like a Maltese, too, barking and annoying, with a cute haircut,

And now I am treated to an absolute astonishing sight. Because now the woman reaches into the bag and begins pulling out little pieces of meat, which she puts on a plastic spoon and feeds to the dog.

This is no cheap steak house. It's actually, way out of my league --I'm there only because it's a special occasion. I can tell you this: if I walked out of the place with any leftover steak, it sure wouldn't go to a dog. Not at those prices.

So now the woman is Spoon-feeding the dog and the man is just standing there, holding this dog and looking as if this is the most normal thing in the world. And the dog is calmly chewing these pieces of steak as if he's a little king. And this dog is in no hurry. He's having a great time.

A few minutes go by, and now the dog finishes all of his steak. At this point, I hear the woman say to the man "Think he's still hungry?" And she glances behind her at the restaurant, as if she might go back in there to get more steak for the dog.

Watching all this, I'm afraid I'm going to shout, "Are you out of your mind? Feeding all that pricey steak to that little dog? Did you see what our American life is like today? We're all going to be eating dog food if this keeps up!"        

小题1:Why would the author live to be 110 in dog years?

A．Because he is always in poor health and falls ill.

B．Because a Maltese dog lives longer than a human being.

C．Because his grandparents left him a large sum of money.

D．Because he thinks the dog is treated extremely well.小题2:What is the story mainly about?

A．An American family's happy life.

B．A Maltese dog getting $12 million from its owner.

C．A New Yorker spending $ 8 billion for a few banks.

D．A pet dog being fed with expensive food.小题3:The underlined sentence "It's actually way out of my league. " (in Para. 6) means __

A．the restaurant is too expensive for the author

B．the author hates the dog being taken there

C．the superb restaurant is about to be out of service

D．the dog doesn't belong to the author's group小题4:Seeing the dog.is being treated to expensive steak, the author becomes extremely ____

A．indifferent

B．annoyed

C．concerned

D．envious

案情甲公司委派业务员张某去乙公司采购大蒜，张某持盖章空白合同书以及采购大蒜授权委托书前往。　　甲、乙公司于2010年3月1日签订大蒜买卖合同，约定由乙公司代办托运，货交承运人丙公司后即视为完成交付。大蒜总价款为100万元，货交丙公司后甲公司付50万元货款，货到甲公司后再付清余款50万元。双方还约定，甲公司向乙公司交付的50万元货款中包含定金20万元，如任何一方违约，需向守约方赔付违约金30万元。　　张某发现乙公司尚有部分绿豆要出售，认为时值绿豆销售旺季，遂于2010年3月1日擅自决定与乙公司再签订一份绿豆买卖合同，总价款为100万元，仍由乙公司代办托运，货交丙公司后即视为完成交付。其他条款与大蒜买卖合同的约定相同。　　2010年4月1日，乙公司按照约定将大蒜和绿豆交给丙公司，甲公司将50万元大蒜货款和50万元绿豆货款汇付给乙公司。按照托运合同，丙公司应在十天内将大蒜和绿豆运至甲公司。　　2010年4月5日，甲、丁公司签订以120万元价格转卖大蒜的合同。4月7日因大蒜价格大涨，甲公司又以150万元价格将大蒜卖给戊公司，并指示丙公司将大蒜运交戊公司。4月8日，丙公司运送大蒜过程中，因山洪暴发大蒜全部毁损。戊公司因未收到货物拒不付款，甲公司因未收到戊公司货款拒绝支付乙公司大蒜尾款50万元。　　后绿豆行情暴涨，丙公司以自己名义按130万元价格将绿豆转卖给不知情的己公司，并迅即交付，但尚未收取货款。甲公司得知后，拒绝追认丙公司行为，要求己公司返还绿豆。　　问题

甲公司与乙公司签订的绿豆买卖合同效力如何？为什么？