小儿出齐乳牙的时间在( )个月。A．8～12 B．12～18 C．18～2

下列括号中物质是除去杂质所用药品，其中错误的是（　　）

A．氧化钙中含杂质碳酸钙（盐酸）

B．硫酸亚铁溶液中含杂质硫酸铜（铁粉）

C．一氧化碳中含杂质二氧化碳（烧碱溶液）

D．盐酸中含杂质硫酸（硝酸钡）

肝硬化腹水患者，出现腹部剧痛，腹胀加重，尿少，腹部压痛，反跳痛，体温38℃，应进一步做哪项检查最有价值()

A．血常规

B．B超

C．腹透

D．外科会诊

E．腹水检查

Go ahead，talk to your dog.

As many a dog owner will prove, our furry friends are listening. Now, for the doubters, there is scientific proof that they understand much of what they hear. A border collie called Rico can fetch at least 200 objects by name， researchers in Germany say. The dog also appears to learn words for new objects as easily as a 3-year-old child would. Its word-learning skill is as good as that of a parrot or chimpanzee.

In one experiment, the researchers took all 200 items that Rico is supposed to know and divided them randomly into 20 sets of 10 objects each. The dog waited with one of his owners in one room, while an experimenter put a set of 10 objects into another room. Then, the owner told the dog to fetch one of the items. The dog had to go to the other room and bring the object back.

In four trials, Rico got 37 out of 40 commands right. Because the dog couldn't see anyone to get visual clues about what to bring back, the scientists concluded that he must understand the meanings of certain words.

In another experiment, the scientists took one toy that Rico had never seen before and put it in a room with seven toys whose names he already knew. The dog's owner then told him to fetch the object, using a word Rico had never heard.

In 7 out of 10 trials, Rico picked the right object, suggesting that he figured out the answer by process of elimination. A month later, he remembered half of the new names, which further impressed the researchers.

Rico is probably smarter than the average dog, the scientists say. For one thing, he's a border collie, a breed known for its mental abilities. In addition, the 9-year-old dog has been trained to retrieve toys by their names since he was 9 months old.

It's hard to know if all dogs understand at least some of the words we say. Even if they do, they can't talk back. Still, it wouldn't hurt to sweet-talk your pup every now and then. You might just get a big, wet kiss in return!

48．The passage is probably taken from a book on _____

A．pets B．environment    C．culture     D．nutrition

49．It is implied that ____

A．Rico is probably cleverer than the average dog

B．Only a few dogs can talk back to its owner

C．if a chimpanzee is trained ,it can also recognize the names of objects

D．All dogs can understand words

50．How long is it since Rico’s owner began to train him?

A．nine months  B．3years    C．over nine years      D．more than eight years

51．Rico can do all the following except _____

A．understanding the meanings of certain words.

B．picking the right object by process of elimination

C．remembering all of the new names he learned    D．retrieving toys by their names

单元教学设计是介于（学科）课程与（）之间的一种阶段性教学设计。单元教学设计除了要保证教学任务的顺利实现之外，还起着协调年级教学进度等方面的作用。

预先注射小量下列哪种药可预防琥珀胆碱的肌束搐颤和术后肌痛（）

A.阿托品

B.苯海拉明

C.硝酸甘油

D.阿曲库铵

E.利多卡因