动脉血气分析的目的，最准确的是（）。 A.了解血氧合饱和度 B.了解酸碱平衡情况 C

依次填入下列各句横线处的词语，最恰当的一组是（    ）

①美国世界级网球名将桑普斯在ATP总决赛冠军争夺战中，以3比0轻松击败他的老对手阿加西，又一次夺得冠军，这是他第五次_____ATP。

②春节期间，北京不少大中型商厦为促销贴出这样的布告：凡在本店购货满300元者，本店将____一份精美的礼品。

③杭州大酒店越来越多，一流厨师供不应求，于是不少店家争相出高价招聘，有人戏称：“酒店挖_____,肥了大厨师”。

A．问鼎惠赠墙角

B．问鼎敬赠墙脚

C．夺冠惠赠墙脚

D．夺冠敬赠墙角

Everybody can suffer from stress. No matter what your age is, you can feel stressed out by things that are happening in your life. Teenagers, however, have many more opportunities to get stressed than people in any other age group. Being a teenager is hard. You are not a child any more, but you are not an adult, even though you have to deal with some very grown-up problems and decisions. Families can be one of the biggest causes of stress, such as problems with parents arguing at home, or problems with brothers and sisters. Teenagers also have a lot of stress from school, either from their teachers or from their friends. Some teenagers also feel stressed about choosing their education after high school. Getting a place at university can be very difficult and some cannot afford to go to university.

The stress about getting a job when finishing school is hard for some teenagers. There are so many young people finishing school and not enough jobs for them. Sadly, there is nothing we can do to remove these causes of stress from the 1ives of teenagers, but you can learn the best way to deal with it. Talking to people is one of the best ways to deal with stress. It may sound simple, but it is true. A problem shared is a problem halved.

小题1:Why is being a teenager often difficult?

A．Because even though you are not an adult, you must deal with adult problems.

B．Because even though you are an adult, you must deal with children's problems.

C．Because even though you are a teenager, you must do a lot of homework.

D．Because adults often make them feel stressed.小题2:Why can leaving high school be a stressful time for teenagers?

A．Because they will be leaving their favourite teachers.

B．Because many people’s favourite memories are at school.

C．Because they may worry about getting a place at university.

D．Because they may worry about becoming an adult.小题3:We can deal with the stress in our life ______.

A．by not trying to find a job

B．by forgetting about our problems

C．by getting a place at university

D．by sharing our problems with our friends小题4:Why can finding a job after finishing school be difficult?

A．Because there are no jobs.

B．Because there is a lot of competition for jobs.

C．Because a job is more difficult than school work.

D．Because there are many places at university.

下列说法中，正确的是（　　）

A．溶于水的强电解质在水中完全电离

B．强电解质在水中溶解度一定大于弱电解质

C．强电解质一定是离子化合物

D．强电解质溶液的导电性一定大于弱电解质

我国古代的成年制度中“加冠”要求男子年满( )。

A．15岁

B．18岁

C．20岁

D．22岁

“气归精，精归化”之“气”是指（）。

A.药食之气

B.卫气

C.人体之气

D.肾气

E.药物之气