优质X线照片不能显示（） A.被照体的大小 B.被照体的形态 C.被照体的轮廓 D.

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        I' m taking my family to other countries to have a trip.  My wife and I and our two children are all

going along. My elder brother will go with us, too. He never been overseas (从未出过国) and he is

even more excited than the children.  My father is so old that he'd like to stay at home and take care

of the house.

       We're going by train to New York, and then take a ship to Europe(欧洲)．When we arnve in

Europe,we're going to some countries for sightseeing(观光).We'll go to places either by train or by bus.

We' re going to fly home.

       It took us a long time to decide where to go, but I think we'Il have a very interesting trip.  We'll go

to England, France and Italy. My wife is very interested in going to France because she is a teacher of

French.And my brother,who speaks very good Italian,is looking forward to the trip to Italy.

       We also talked about how we would go to Europe. At first we wanted to fly because it would be

faster andwould save(节省)more time, But my brother likes to take a boat trip and the children like that,

too.

1. My brother is very excited because________

A. he has many friends in other countries

B. he has never traveled by plane

C. he wants to buy some books in Italy    

D. he has never been overseas

2. We're coming back home by          ____.  

A. sea    

B. air    

C. bus    

D. train

3. In Europe we will          ____.

A. go sightseeing at tlle seaside    

B. to go different countries by ship

C. buy a lot of presents    

D. go from place to place by train or by bus

4. My wife works in a           ____  

A. hospital    

B. factory    

C. shop    

D. school

5. My brotIler and my children would like to        ____.

A. do some shopping in Europe    

B. study the Italian language in Italy

C. enjoy a trip by ship    

D. I earn.rench in France

水生生态环境调查中，不属于初级生产量测定方法的是( )。

A．二氧化碳的测定法

B．氧气测定法

C．叶绿素测定法

D．有机物测定法

如图所示，水平面上放有质量均为m＝1 kg的物块A和B(均视为质点)，A、B与地面的动摩擦因数分别为μ₁＝0.4和μ₂＝0.1，相距l＝0.75 m。现给物块A一初速度使之向物块B运动，与此同时给物块B一个F＝3 N水平向右的力使其由静止开始运动，经过一段时间A恰好能追上B。g＝10 m/s²。求：

(1)物块B运动的加速度大小；

(2)物块A初速度大小。

在进行小儿癫痫患者的脑电图检查时，不妥的是（）。

A.尽力避免使用镇静剂

B.停用抗癫痫药

C.发作间期脑电图应包括睡眠及清醒记录

D.记录时间不小于20min

E.必要时作24h脑电图

防硫防喷演习和关井要求：关井完成后，班组人员立即撤离到上风方向的紧急集合点，值班干部清点人数，派2人佩戴好正压式呼吸器到井口附近检测H₂S浓度，观测关井（）。

A.立压

B.套压

C.立压和套压

D.钻井液增量