肠腺瘤和肠腺癌的主要鉴别依据是（）。 A.黏液分泌量多少 B.肿瘤的大小 C.细胞异

在分别写有数字1、2、3、4、5的5张小卡片中，随机地抽出1张卡片，则抽出卡片上的数字是1的概率为（    ）。　

阅读理解。

     For Americans, a mosquito bite is an itchy (发痒的) bother. But for many in Africa, a tiny bite can be

deadly. One million people die each year of malaria, a disease spread by infected mosquitoes. Most of these

people live in Africa, and are under age 5.

     Malaria can be prevented and treated. However, many African nations don't have the funds (基金) to

fight it. Nothing but Nets (NBN) hopes to change that. The United Nations Foundation created the campaign

in 2006. The aim is to prevent malaria by covering sleeping areas with nets. Hanging bed nets treated with

insecticide (杀虫剂) is the simplest way to stop mosquitoes from biting at night. The chemicals last four to

five years. For $10, anyone can send a net to Africa and help save a life.

     So far, NBN has raised $19 million and delivered 700 000 nets to seven countries. Families are taught how

to use the nets. Kids also get vaccines (疫苗) and vitamins. "Women line up for miles to get the medicine for

their kids," says NBN director Elizabeth McKee Gore. "They understand the importance." So do kids in this

country. "They get so excited thinking of ways to raise money," says NBN spokesperson and basketball star

Ruth Riley.

     NBN's biggest fund-raiser is Katherine Commale, a seven-year-old girl. She's been spreading the information

about bed nets for the past two years. To show how they work, she and her brother made a video. "We teach

that bed nets can save lives," she said.

     Katherine has raised $ 42 000 for NBN. "She just wants those who need a net to have one," says her morn,

Lynda. "It's pretty simple to her." To find out how you can help, visit nothingbutnets, net.

1. Why don't those African nations do something about malaria?

A. Because the disease cannot be prevented and treated.

B. Because those nations don't know what to do with it.

C. Because those nations don't have the money for it.

D. Because nothing but nets can change it.

2. The underlined word "they" here refers to "_____".

A. bed nets

B. fund-raisers

C. families who are taught to use the nets

D. Katherine and her brother

3. How does Katherine Commale raise money?

A. By visiting nothingbutnets, net.

B. By spreading information about bed nets.

C. By teaching people how to use bed nets.

D. By making video programs.

甲状腺上结节的物理学检查，下列哪项是正确的（）

A.随伸舌移动

B.随吞咽移动

C.随呼吸移动

D.不随吞咽移动

E.以上皆不是

哪位传播学创始人提出了“刻板模式”（）.

A.李普曼

B.拉斯韦尔

C.霍夫兰

D.拉扎斯菲尔德

计算题：某冲压车间一板料尺寸如下图，现在进行降成本活动，在原有基础上左右各裁去一50mm×50mm的三角形。按材料价格7元/kg，年产量28万个冲压件，求单件材料的利用率提高了多少，每年节约的材料成本。（已知材料的密度为7.85kg/dm³）