解方程：|x-|3x+1||=4；

阅读下面的短文，按要求选择正确答案。

      It's nine o'clock in the morning. The family is at home. Jim's father is sitting in a chair. He's watching TV.

Jim's mother is standing near the window. She's giving some food to a bird, Polly. Polly says, " Thanks!

Thanks! " Where's Jim? Oh! He's behind the door. Kate, Jim's sister, is looking for him. They are playing

games. They have no homework on Sunday evening.

1. There are _____________ people in the family.

A. three

B. four

C. five

D. six

2. Who is watching TV in a chair?

A. Jim.

B. Jim's mother.

C. Jim's father.

D. Jim's sister.

3. Jim and Kate are _____________.

A. good friends

B. two girls

C. two boys

D. brother and sister

4. The children _____________ doing their homework.

A. aren't

B. isn't

C. don't

D. not

5. What's Kate doing?

A. She's doing her homework.

B. She's standing near the window.

C. She's looking for a pen.

D. She's playing games.

下列几组地理现象排列顺序正确的是…………………………………………（　　）

A．气温日变化：敦煌＞兰州＞青岛＞洛阳

B．年均降水量：广州＞南昌＞西安＞玉门

C．气温年变化：广州＞兰州＞成都＞敦煌

D．地面反射率：沙土＞草地＞海洋＞林地

在春播期间，某实验小组对一农田进行检测时，发现其氮元素和磷元素偏低．你认为应建议施用的下列一种物质是（　　）

A．KCl

B．NH₄NO₃

C．K₂SO₄

D．NH₄H₂PO₄

系统日志默认文件大小为（）。

A.128MB

B.512MB

C.256MB

D.211MB

三合土垫层其铺设方法可采用先拌合后铺设或先铺设碎料后灌砂浆的方法，但均应铺平夯实。( )