下列各项功能中哪一项不是一般植物的茎所具备的功能（）。 A.吸收 B.支持 C.输导

Englishmen speak British English and Americans speak American English. A student is learning to speak British English. He often asks himself, “Can Americans understand me when I speak British English?” Learners often ask “What’s the difference between British English and American English?”Certainly there are some differences between British and American English. The Englishmen say “Have you a pen?” While Americans say “Do you have a pen?” The pronunciation is sometimes different. Americans often sound “r” in words like “bird” and “hurt”. The British speakers don’t sound the “r” in these words. There are differences in spelling. For example, “colour” and “neighbour” are British while “color” and “neighbor” are American. These differences in grammar, pronunciation and spelling are not important, however. For the most part, British and American English are the same language. When Englishmen and Americans are talking with each other, they don’t need an interpreter(翻译). Maybe some day they need, but not now.

小题1:Between British and American English, _______.

A．the greatest difference is in spelling

B．there are differences in many ways

C．people can’t understand each other

D．students don’t know the difference小题2:When a student is asking himself “Can Americans understand me when I speak British English?” it shows that_______.

A．he wants to learn American English

B．he doesn’t like British English

C．he hasn’t spoken to any American so far

D．he is going to spend more time on American English小题3:43. The differences between British and American English are not important because______

A．everyone knows the differences 　　

B．people talk to each other very often

C．Englishmen and Americans get along well

D．British English and American English are the same language小题4:“Have you a pen” and “Do you have a pen?” show a difference in______

A．grammar

B．spelling

C．pronunciation

D．listening小题5:At the end of the passage the writer wants to tell us _______.

A．British and American English will be two different languages some day

B．Englishmen and Americans will never need an interpreter while talking

C．there will be no more differences between British and American English

D．the differences between British English and American English will grow larger

什么是税收？

区域市场

控制病毒遗传变异的病毒成分是（）。

A.核酸

B.染色体

C.壳粒

D.衣壳

E.包膜

对建立良好的程序设计风格，下面描述正确的是 ______。

A) 程序应简单、清晰、可读性好 B) 符号名的命名要符合语法
C) 充分考虑程序的执行效率
D) 程序的注释可有可无