已知x=-1是关于x的方程2kx2+kx+2=k的一个根，求作以2k和k+1为根

阅读理解。

     AMERICANS love to drive. They have drive-in movie theaters,drive-through restaurants and

driving vacations. It's often called the Great American Road Trip ":your whole  family gets into a van

(货车) or recreational vehicle (RV, 旅行房车), and hits the road for a summer trip across the country.

      American cars are always big, but Rvs are the biggest. These are houses on wheels. RVs have

kitchens,bathrooms and bedrooms. All across the country you can find RV parks-places to park your

RV and spend the night. And, if you can't find one,you can always make your home in a grocery store

(杂货店) parking lot.

    As big as RVs are , they still seem very small to a family who has to spend every hour of everyday

together. With your little brother kicking you in the face all night in your tiny bed under the table, the

dog barking and Mom playing her country music on the radio , your family is not at its best. What's

worse , RVs are always breaking down. So expect to spend a lot of time watching dad under the RV

on the side of a dusty road.

     But RV travel can be a great time with the family, too. You can see the country in your own

comfortable "home". You can spend every night in different places , or just stay where you are. You

don't have to pay for hotels or restaurants, only gas. But, best of all, you are free to go wherever you

want whenever you want in your home away from home.

1. RVs don't have ______.

A. Bathrooms

B. Gardens

C. Bedrooms

D. Kitchens

2. The underlined word "kicking" in the passage means "______".

A. 撞        

B. 打      

C. 踢

D. 挤

3. Why do American people like to travel in RVs?

A. Because RVs can go faster than other cars.

B. Because they don't have to pay for gas.

C. Because RVs never break down on the road.

D. Because they can spend every night in a different place.

4. If you travel in RVs, you don't need to ______.     

A. stay where you are     

B. pay for hotels or restaurants     

C. see the country in your own comfortable "home"

D. be free to go wherever you want whenever you want in your home away from home

5. Which of the following is TRUE according to the passage?     

A. Traveling in RVs is more expensive than living in hotels.      

B. RVs are big enough for families traveling together.     

C. It is not difficult to find parking places for RVs and spend the night.     

D. It is less fun to travel in RVs than to stay in hotels.

下列物质按酸、碱、盐顺序排列的是（　　）

A．Mg（OH）₂、CuSO₄、H₂CO₃

B．HNO₃、KOH、NaCl

C．CaCO₃、NaOH、H₃PO₄

D．H₂SO₄、KNO₃、NaOH

— My mother is ill. I can't go with you.

— __________

[      ]

A. Thank you.

B. It doesn't matter.

C. I'm glad to hear that.

D. I am sorry to hear that.

电气设备的预防性试验分为两类试验：（）、（）。

化学名为2-［（2，6-二氯苯基）氨基］苯乙酸钠的药物的主要临床用途是（）

A.解热镇痛药物

B.麻醉镇痛药物

C.镇痛消炎作用

D.抗痛风药物

E.降压作用