断面深棕黄色至金黄色，角质，维管束小点散在的药材为（） A．天冬 B．莪术 C．姜黄

注册会计师审计重要资产项目的真实性时常常采用函证审计程序，请依据函证准则对下列陈述进行分析判断。

下列有关应收账款函证叙述正确的有（）。

A．对应收账款的审计主要采用函证的方法来证实其存在性和所有权

B．账龄长，金额较大的应收账款是注册会计师必须向债务人函证的对象

C．函证一般可采用积极式，也可采用消极式

D．对于采用积极式函证未取得回函的，一般应发送二次乃至三次询证函，如仍未得到答复，注册会计师采用必要的替代程序

在横线里填上“＞”“＜”或“=” 4厘米______39毫米 70毫米______70厘米 6千克______6吨 5千米______4980米 10米+9厘米______20米 3吨+4吨______7000千克 2吨______960千克 1000克______3千克 45克______3千克 2050克______2049千克 4千米______4200米 100毫米______1分米．

甲、乙、丙、丁四位同学，用铁与稀硫酸反应，所得有关数据记录如下：

	甲	乙	丙	丁
取用稀硫酸的质量/g	100	100	100	100
加入金属的质量/g	x	1.25x	1.5x	2x
生成氢气的质量/g	0.4	0.5	0.6	0.6

计算甲同学加入金属铁的质量．

A famous study was done in a school by a professor from a university．At the start of the school year，the teachers were given the names of five children．They were told that these five were the most excellent students in the class．But the fact was that these students were only average，and they were not the best students at all．Well，guess what? At the end of the year，all the five average students scored among the highest in the class．

What made these average students change so much to become top students? The only difference was the change in their teachers’ attitude．Because the teachers believed that these five kids were the top students，they expected more from them．And so these five average students began to believe and expect more from themselves．So they worked harder to do as well as they could．

Do you know? If you expect the best from people，they’ll usually want to give you their best．A great leader said，“Treat a person just how he appears to be on the outside，and you’ll make him even worse．But treat a person like he’s already a success，and you’ll help make him the best he can be．”

Like the true story of 7-year-old Johnny，his teacher got so angry with him that one day she said，“Johnny，you’re the naughtiest(最顽皮的) boy in this class．I’m sure you’ll never change．”The next year Johnny had a new teacher．And on the first day of class，she met with Johnny after school and said，“Johnny，I’ve heard a lot about you! But do you know that I don’t believe a word of it．”And every day after that，this new teacher treated Johnny as if he was one of the smartest students even when Johnny did naughty things．Later on，Johnny became a school leader．Because that’s the power of our belief and attitude toward children．

1．The professor started his research by ________．

A．telling the five students to work harder than ever before

B．teaching the five children himself

C．telling the teacher the five students were the best in the class

D．asking the five children to find a new teacher

2．The five average students became top students mainly because of ________．

A．the professor’s study     B．the change in the professor’s attitude

C．the teachers’ hard work   D．the change in the teachers’ attitude

3．Why did the writer tell us the story of 7-year-old Johnny?

A．To show the importance of encouragement．

B．To show that the boy was clever enough．

C．To let us know the famous boy．

D．To let us know how good his new teacher was．

4．According to the story，we can learn that ________．

A．the research began at the end of the school year

B．the students scored highest only because they worked hard

C．if you expect the most from people，you’ll get the least

D．little Johnny liked his new teacher very much

5．What does the passage mainly tell us?

A．If you want to get more，you should have new teachers．

B．Attitude and belief can change a person．

C．A professor’s study can help you score highest．

D．Only teachers can make you a top student．

对一路信号进行FSK调制时，若载波频率为f₀，调制后的信号频率分别为f₁和f₂(f₁＞f₂)，则f₀、f₁、f₂三者的关系是 (18) 。

A．f₂-f₁=f₀

B．f₂+f₁=f₀

C．f₁/f₂=f₀

D．f₀-f₂=f₁-f₀