胃肠道手术前（）开始进流质饮食，对于有幽门梗阻的病人术前应（）。

We provide summer English courses which are the best you can find. You will enjoy coming to Los Angeles to learn about American culture and improve your English at the same time. The courses last for four, six or eight weeks. They start at the beginning of July and August. Our teachers are well-trained and very experienced. They teach English classes for four hours a day, You can choose between small groups of two or three, or larger groups of up to 15. We provide weekly

tests to see the progress you’ re making with your language skills of reading, writing, speaking and listening. We also provide books and other materials.

As well as learning English, we want you to experience life in the USA. You live with an American family, and you take part in American life. You have meals with an American family and do some activities with them, too. For many of our students this is the most interesting part of the course. Many families create friendships with the students which last a long time. Of course, if you

prefer, we can arrange hotel accommodation.       

Of course, there are many things to do in Los Angeles. Every day we have activities which take place after class. You can choose to take trips to Hollywood, Disneyland or the famous beaches around LA. You can also go to various shopping centers, sports centers, movies and concerts. There are also weekend visits’  organized to San Francisco and other places of interest in California.

We try to give our students the best possible experience of English and life in the USA. Just ask our students! They say our summer English courses are fantastic!

We hope that you’ ll  enjoy a course with us, too. If you’ re interested, please fill in our application form where you will also find our list of prices.’ The course must be paid for one month before it begins.

小题1: The shortest summer English course will last for         

A．two weeks

B．four weeks

C．six weeks

D．eight weeks小题2:Which of the following is TRUE about the summer English courses?   

A．The students have to take an entrance test.

B．Each class has two or three groups of students.

C．All the teachers are young but very experienced.

D．Tests will be provided regularly to see if students have made progress.小题3: What is Paragraph 2 mainly about?

A．Accommodation and food.

B．Why the students enjoy themselves.

C．Sightseeing and other activities after class.

D．The most interesting part of the summer English courses.小题4:If you want to take part in the course, you must __ first.

A．pay for a one-month course

B．fill in the application form

C．choose an American family

D．learn about American culture小题5:The passage is a __

A．guide to Los Angeles

B．description of life in Los Angeles

C．description often English course

D．newspaper article on language learning

在一张横轴位MRI，区分左右方向质子群位置的是（）

A.特殊的射频脉冲

B.特殊的接收线圈

C.G_z梯度磁场

D.G_x梯度磁场

E.G_y梯度磁场

北京××商贸有限公司(1101210078)委托辽宁×××进出口公司(2101910061)与韩国签约，为河北××钢铁有限公司(1312931542)进口B50-71A型电动叉车。货物运抵进境后，由大连××货运代理公司(2102981013)向进境地海关申报。

请根据以上资料，选择以下栏目正确选项：

“毛重”栏（）。

A．3

B．18.90

C．15025

D．17951

配位滴定时，金属离子M和N的浓度相近，通过控制溶液酸度实现连续测定M和N的条件是( )。

A．lgK_NY-lgK_MY≥2且lgcK'_MY和lgcK'_NY均大于6

B．lgK_NY-lgK_MY≥5且lgcK'_MY和lgcK'_NY均大于3

C．lgK_MY-lgK_NY≥5且lgcK'_MY和lgcK'_NY均大于6

D．lgK_MY-lgK_NY≥8且lgcK'_MY和lgcK'_NY均大于4

交流电的电感一定时，交流电的频率越高则感抗越____。