地陪应严格按照旅游合同规定的时间和次数安排旅游团到旅行社指定的商店购物，购物必须遵循

以下杂质检查所用的试剂为：砷盐的检查（）.

A．稀盐酸 

B．锌粒 

C．稀硫酸 

D．甲基红指示液 

E．醋酸盐缓冲液（pH3.5）

如图所示，是利用放射线自动控制铝板厚度的装置。假如放射源能放射出α、β、γ三种射线，而根据设计，该生产线压制的是3mm厚的铝板，那么是三种射线中的何种射线对控制厚度起主要作用。当探测接收器单位时间内接收到的放射性粒子的个数超过标准值时，将会通过自动装置将M、N两个轧辊间的距离如何调节

A.α；大些

B.β；大些 

C.γ；大些

D.α；小些

阅读理解。

     Some years ago on a hot summer day in south Florida a little boy decided to go for a swim in the old

swimming hole behind his house. In a hurry to dive into the cool water, he ran out of the back door,

leaving behind shoes, socks, and shirt as he went.

     He flew into the water, not realizing that as he swam toward the middle of the lake, a crocodile was

swimming toward him. His mother in the house was looking out of the window and saw the two. In great

fear, she ran toward the water, shouting to her son as loudly as she could. Hearing her voice, the little

boy became alarmed and made a U-turn to swim to his mother. It was too late. Just as he reached her,

the crocodile reached him. From the shore, the mother grabbed her little boy by the arms just as the

crocodile snatched his legs. That began an incredible tug-of-war between the two. The crocodile was

much stronger than the mother, but the mother was much too passionate to let go. A farmer happened

to drive by, heard their screams, raced from his truck, took aim and shot the crocodile.

     Remarkably, after weeks and weeks in the hospital, the little boy survived. His legs were extremely

scarred by the attack of the animal. And, on his arms, were deep scratches where his mother's fingernails

dug into his flesh in her effort to hang on to the son she loved.

     The newspaper reporter, who interviewed the boy, asked if he would show him his scars. The boy

lifted his legs. And then, with obvious pride, he said to the reporter, "But look at my arms. I have great

scars on my arms, too. I have them because my Mom wouldn't let go. "

      Never judge another person's scars, because you don't know how they were made.

1. By saying "But look at my arms. I have great scars on my arms, too" in paragraph 4,the boy really

    wants to show__________.

A. how deep the scars made by the crocodile were

B. what a brave and courageous boy he was

C. how many scars and scratches he had

D. how great and beloved his mother was

2. Hearing Mother's shouts, the boy______. 

A. remained in the middle at a loss    

B. didn't stop swimming forwards

C. swam back towards the shore

D. was ready to fight the crocodile

3. Which of the following statements is true according to the text?

A. A crocodile attacked him when the boy and his mother were swimming.

B. The crocodile bit the arms of the boy when it reached him.

C. There is always an interesting story behind every scar.

D. It was the farmer who shot the crocodile.

4. Which of the following will be the best title for the text?

A. Scars of Love                  

B. Women Hold up Half the Sky

C. A Terrible Experience              

D. Don't Judge by Appearances

已知：A是相对分子质量最小的氧化物，D是天然气中最主要的成分．请分析A、B、D、E五种物质之间的变化关系，下列推断正确的是（　　）

A．D是CH₄、A是H₂O₂

B．D是CH₄、A是H₂O

C．B是H₂、是O₂

D．B是O₂、E是O

营养标签包括（）。

A.相关的营养常识

B.营养成分标示

C.附加的营养信息

D.附加的营养知识

E.营养素含量