已知向量AB=(4，5)，AC=(8，k)，若A，B，C三点共线，则k=____

Do you want to know something about children in Africa? What do they do for fun every day? Find out here:

Education

School is expensive for many African children. Lots of families can’t afford school uniforms or exercise books even though they don’t have to pay for school.

For those lucky enough to go to school, they have a lot to learn. Some take two language classes: English or French, and their first languages. There is also math, science, history and geography. Chores take up much of children’s time after school. They have to get water and firewood for the family every day. Also there’s cleaning, washing and helping Mum with the meal.

Daily fun

It’s not all work and no play. Sports are very popular. Children can make goals with twigs(嫩枝) and their own footballs with plastic and bits of string(绳子).They play in the country and the streets of old towns. There’re many football teams for teenagers in Africa.

Internet

It’s really expensive to get on the Internet. To surf the net for 20 hours costs 600yuan.This is more than the average（平均的） monthly pay per person.

Egypt and South Africa are the top two users of the Internet in Africa. All of the capital cities there can get on the Internet.

Some schools offer computer lessons but few students can enjoy computer fun at home.

小题1:The underlined word “Chores” probably means______.

A．网上冲浪

B．家务杂活

C．体育活动

D．家庭作业小题2:Sports are very popular in Africa because children_______.

A．do not need money to play

B．can play all kinds of ball games

C．don’t like to go to school

D．don’t like to do their homework小题3: In Africa ,how many hours can you use all your pay to surf the Internet in a year .And you only have the average pay.

A． 20 hours

B． more than 240 hours

C．about 240 hours

D．about 20 hours

威胁焦虑症患者生命安全的最大的因素是（）。

A.噎食

B.药物不良反应

C.焦虑引发的睡眠障碍

D.自杀、自伤倾向

E.焦虑引发的高血压和心脏病

对于现场所用在材料、半成品、工序过程或工程产品质量检验的主要方法有（）。

A.全数检验

B.抽样检测

C.审核质量报告

D.目测法，量测法，试验法

一个网站后台登录系统由用户名和密码两部分数据组成，登录操作对两个输入数据进行检查，具体要求如下：
(1)要求用户名中只能包含字母、数字和下划线(字母不区分大小写)，密码可以包含任何字符。
(2)用户名和密码都不能为空且长度都应在16位以内。
(3)当用户名或密码为空时，则登录失败并提示对应的出错信息。
(4)当用户名不正确或用户名不存在或密码错误时，则登录失败并提示以下三种相应的出错信息：用户名不合法(即包含非字母、非数字字符、非下划线)，或用户名不存在，或密码错误，当用户名和密码都正确时，显示登录成功，完成登录。
假设正确的用户名是admin_001，密码是001。
请用等价类方法为上述规格说明设计等价类表。

可通过以下（）途径来加强反洗钱可疑案例的分析甄别。

A.提升反洗钱专业能力

B.强化人工识别

C.加强尽职调查

D.结合地域特点分析