鸦片贸易对中国造成了哪些危害？

设有学生选课表SC(学号，课程号，成绩)，用SQL语言检索每门课程的课程号及平均分的语句是(关键词必须拼写完整)：
SELECT课程号，AVG(成绩)FROM SC 【14】 。

Joanne was stuck in a traffic jam in central Birmingham at 5：30 and at 6：30 she was expected to be chairing a meeting of the tennis club．At last，the traffic was moving．She swung quickly racing to her house. As she opened the door，she nearly tripped over Sheba．

“Hey，Sheba，”she said，“I've got no time for you now，but I'll take you out as soon as I get back from tennis club．”Then she noticed Sheba seemed to be coughing or choking .Obviously，she could hardly breathe．Immediately Joanne realized she would have to take her to the vet(兽医).

When she got there，the vet was just about to close for the day. Seeing the state of Sheba，Dr．Sterne brought her quickly into his office．

“Listen，doctor，I'm really in a rush to get to a meeting can I leave her with you，and go and get changed? I'll be back in ten minutes to pick her up，and then I'll take her on to the meeting with me. Is that OK?”

“Sure．”said the doctor

Joanne made the quick trip back to her house in a couple of minutes．As she was entering the hallway，the phone by the door began to ring．

“This is Dr．Sterne,” said an anxious voice,“I want you to get out of that house immediately，”said the doctor's voice．“I'm coming round fight away，and the police will be there any time now．Wait outside!”

At that moment，a police car screeched to a stop outside the house．Two policemen got out and ran into the house．Joanne was by now completely confused and very frightened．Then the doctor arrived．

“Where’s Sheba? Is she OK?”shouted Joanne．

“She’s fine，Joanne．I took out the thing which was choking her，and she’s OK now．”

Just then，the two policemen reappeared from the house，half-carrying a white—faced man，who could hardly walk．There was blood all over him．

“My God，”said Joanne，“how did he get in there? And how did you know he was there?”

“I think he must be a burglar．”said the doctor．“I knew he was there because when I finally removed what was stuck in Sheba’s throat：it turned out to be three human fingers”

小题1:What was Joanne supposed to do at 6：30？

A．To attend a club meeting．

B．To walk her dog

C．To see her doctor．

D．To play tennis with her friends．小题2:Joanne wanted to get back to her home again          ．

A．to phone the police station

B．to catch the badly hurt burglar

C．to dress up for the meeting

D．to wait for her dog to be cured小题3:From the passage，we can infer that        ．

A．Sheba fought against the burglar

B．Joanne had planned to take her dog to the meeting

C．the police found the burglar had broken in

D．the doctor performed a difficult operation on the dog小题4:In this passage，the writer intends to tell us that the dog is          ．

A．clever

B．devoted

C．friendly

D．frightening

面波有（）和（），传播速度，纵波最快横波次之面波最慢。

E

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有多余选项。

Getting your children to study can be a little like getting them to eat their vegetables.

71   Make a study time and have it at  the same time every day. This will help your kids to learn to schedule their day and will give them a sense of control over how they spend their time.

Allow them to study in blocks of time, such as for half an hour with a five-minute break in the middle.    72   ideal （理想的）study times are after dinner or right after school before dinner.

Never allow your children to study in front of the television, as that will encourage passive activity.   73   

You’ll also need to help your kids find the right place to study. After you’ve set up a good study time for little learners, set up a good place where they can get those creative juices flowing.

74   Make sure there is a table or a desk and a comfortable chair.

75   This includes helping them out with their homework sometimes and being there for them with the answers to any questions. The input you give your children during study periods will help form a bond and help make studying enjoyable.

A．One of the best ways to form good study habits for your kids is to design a schedule that they keep to.

B．Finally, spend time with your kids when they’re studying.

C．Pick a place where your children can study properly.

D．Keep the atmosphere light and offer lots of encouragement, too.E. Instead, use TV as a treat or a reward when the homework is completed.

F. Try to stop this bad habit by offering some sort of reward.

G. Hold them to the schedule they create for themselves

暑、火、燥三邪的共同致病特点是（）

A.为阳邪

B.炎热

C.伤津

D.动血

E.生风