问题 选择题

两个完全相同的玻璃缸装满了水,缸中分别漂浮着一只玩具鸭子,如图所示。下列关于两只鸭子受到的浮力及缸底受到水的压强的说法正确的是

A.甲缸中鸭子受到的浮力大

B.乙缸中鸭子受到的浮力大

C.甲缸底部受到水的压强大

D.乙缸底部受到水的压强大

答案

答案:B

题目分析:鸭子漂浮在水面上,所以受到的浮力等于重,因乙鸭子较大,所受的重力较大,所以乙的浮力大,故A错误;B正确;

两容器的深度相同,根据,在水中密度相等,所以容器底受到的压强相等,故CD错误。

故选B。

点评:关键是利用物体的浮沉条件和阿基米德原理进行解答。

阅读理解

阅读理解。

                                                                  L1PITOR

     ABOUT LIPITOR  

     Lipitor is a prescription medicine. Along with diet and exercise,it lowers "bad,' cholesterol (胆固醇) in

your blood.It can also raise "good'' cholesterol?   Lipitor can lower the risk of heart attack in patients with several common risk factors, including family history of early heart disease,high blood pressure,age and

smokin9 ?

     WHO IS LIPITOR FOR?

      Who can take LIPITOR: .

     People who cannot lower their cholesterol enough with diet and exercise  

     .Adults and children over l0  

     Who should NOT take LIPITOR:

     .Women who are pregnant,may be pregnant,or may become pregnant. Lipitor may harm   your

unborn baby.

     .women who are breast-feeding. Lipitor can pass into your breast milk and may harm   your baby.  

      .People with liver(肝脏)problems

      POSSIBLE SIDE EFFECTS OF LIPITOR

     Serious side effects in a small number of people: .

     Muscle(肌肉)problems that can lead to kidney(肾脏)problems,including kidney failure .

     Liver problems.

     Your doctor may do blood tests to check your liver before you start   Lipitor and while you are taking

it.

     Call your doctor right away if you have:

    .Unexplained muscle pain or weakness,especially if you have a fever or feel very fired

     .Swelling of the face,lips,tongue,and/or throat that may cause difficulty in breathing or   swallowing  

     .Stomach pain

     Some common side effects of LIPITOR are:

     .Muscle pain  

     .Upset stomach 

     .Changes in some blood tests

     HOW TO TAKE LIPITOR

     DO:

     Take Lipitor as prescribed by your doctor.

     Try to eat heart-healthy foods while you take Lipitor.

     Take Lipitor at any time of day, with or without food. If you miss a dose (一剂), take it as soon as you

remember. But if it has been more than   12 hours since your missed dose,wait.

     Take the next dose at your regular time.

     Don't: Do not change or stop your dose before talking to your doctor.

     Do not take new medicines before talking to your doctor.

1.What is a major function of Lipitor?

A. To help quit smoking.

B. To control blood pressure.

C. To improve unhealthy diet.

D. To lower "bad" cholesterol.

2. Taking Lipitor is helpful for             .

A. breast-feeding women

B. women who are pregnant

C. adults having heart disease

D. teenagers with liver problems

3. If it has been over 12 hours since you missed a dose, you should         .

A. change the amount of your next dose  

B. eat more when taking your next dose

C. have a dose as soon as you remember  

D. take the next dose at your regular time

4. Which of the following is a common side effect of taking Lipitor?

A. Face swelling.                    

B. Upset stomach.

C. Kidney failure..

D. Muscle weakness.

5. What is the main purpose of the passage?

A. To teach patients ways for quick recovery.    

B. To present a report on a scientific research.

C. To show the importance of a good lifestyle.

D. To give information about a kind of medicine.

判断题