802.1x可以工作在端口模式和MAC模式下，当有802.1x用户在线时，不允许执行

中国是联合国创始会员国和安理会常任理事国，中国同联合国各机构的合作富有成果。中国关于联合国的基本政策是 [ ]

①支持联合国为促进共同发展做出更大贡献 ②支持联合国继续进行必要的和合理的改革 ③支持联合国为维护国际和平发挥主导作用 ④支持和参与联合国的各项工作和各项活动

A．①②

B．②③

C．①②③

D．①②③④

如图是手推车，车厢内货物摆放均匀，前后轮安装对称，当前轮遇到障碍物C时，用竖直往下200N的力按扶手，前轮恰好微微抬起越过障碍物，扶手重力忽略不计，手推车相关尺寸如图，求：

（1）货物和车厢的总重力

（2）当前轮过了障碍物，向前运动后轮遇到障碍物时，如果竖直向上用力提起扶手，使后轮微微抬起越过障碍物，则要用多大的力？

阅读理解。

     When I was eight, I saw a movie about an island that had an erupting volcano and jungles filled with wild

animals. The island was ruled by a beautiful woman called Tondalaya, the Fire Goddess of the Volcano. It was

a low budget movie, but to me, it represented the perfect life. But through the years, Tondalaya was forgotten.

     The week I turned 50, my marriage came to a sudden end. My house, furniture and everything I'd owned

was sold to pay debts that I didn't even know existed. In a week I had lost my husband, my home and my

parents who had refused to accept a divorce (离婚) in the family. I'd lost everything except my four teenage

children. I used every penny I had to buy five plane tickets from Missouri to Hawaii. Everyone said I was

crazy to think I could just run off to an island and survive. I was afraid they were right.

     I worked 18 hours a day and lost 30 pounds because I lived on one meal a day. One night as I walked alone

on the beach, I saw the red orange lava (火山岩) pouring out of Kilauea Volcano in the distance. It was time to

live my imagination!

     The next day, I quit my job, bought some art supplies and began doing what I'loved. I hadn't painted a

picture in 15 years. I wondered if I could still paint. My hands trembled the first time I picked up a brush. But

before an hour had passed, I was lost in the colors spreading across the canvas (画布) in front of me. And as

soon as I started believing in myself, other people started believing in me, too. The first painting sold for $1 500. 

     The past six years have been filled with adventures. My children and I have gone swimming with dolphins,

watched whales and hiked around the crater rim (火山口边缘) of the volcano. We wake up every morning

with the ocean in front of us and the volcano behind us. The dream I had more than 40 years ago is now reality.

I'm living freely and happily ever after.

1. Why did the writer go to Hawaii?

A. To make a living.

B. To spend her holiday.

C. To free herself from trouble.

D. To realize her childhood dream.

2. Which of the following is the writer's dream?

A. Get close to wildlife.

B. Live a free and happy life.

C. Live in nature with animals.

D. Become a successful painter.

3. We can infer from the passage that _____.

A. the writer had never done painting before

B. the writer's parents encouraged her to divorce

C. the writer's husband took away most of her money

D. the writer wasn't sure whether she could survive in Hawaii at first

最可能成为有效分蘖的是（）

A.缩心孽

B.低位孽

C.高位孽

D.二级分蘖

早期胃癌确诊的首选方法是（）

A.超声

B.CT

C.胃镜活检

D.胃肠气钡双重造影

E.MRI