下列属于双子叶植物根异常构造的有（） A.多环性同心环排列的维管束 B.韧皮部维管束

把一个标有“6V，3W”的灯泡接在10伏的电源上，要使灯泡正常发光，需要________联一个________欧的电阻，此时电阻消耗的电功率是_________瓦。

在科学探究学习活动中，教师将三包黑色粉末（分别是细铁粉、氧化铜和二氧化锰）和三瓶无色溶液．分别发给三个学习小组进行物质鉴别等问题的探究；每组一包黑色粉末和一瓶无色溶液；各组取样放入试管中混合后，甲、乙两组都观察到有无色气体产生，丙组观察到无色溶液变蓝色．请你和他们一起探究：

（1）写出丙组试管中无色溶液变蓝的化学反应方程式______．

（2）请你对甲、乙两组的黑色粉末和无色溶液是什么物质进行大胆猜想：

甲组：黑色粉末和无色溶液是______；乙组：黑色粉末和无色溶液是______．

（3）请你设计一个实验来验证甲组或乙组的黑色粉末是哪一种．

出现瘀血证时，面部颜色可见（）

A.青色、赤色

B.黑色、青色

C.黄色、黑色

D.赤色、白色

E.赤色、黑色

阅读理解。

     Barcelona is regarded as Spain's second city, behind capital Madrid. The city is rich in history. Barcelona

was founded by Carthaginians and according to tradition, it got its name from the great Barker family of

ancient Carpage. After numerous different conquers, including the Romans and the Moores that seriously

damaged the city, the Argons made Catalonia, of which Barcelona was the capital. Strong and prosperous,

since the 1970s, the city has formed its Catalon background. But it wasn't until the summer Olympics in 1992

that Barcelona became the modern, lively city that it still is today. And with this prosperity have come

wonderful hotels. The Raewon Callas the 1st was opened in 1992, by the King and Queen of Spain.

     With buildings like the Casa Cal Bain and the Casa Minga, Antony Gaudy is believed to have made great

impact on the image of Barcelona. He also built the fantastic Park Quell. Antony Gaudy died in 1926, leaving

an unfinished cathedral as his epitaph (墓志铭).

     There are the attractions of coming to Barcelona?

     There are many, many different attractions: culture, leisure, monuments, our architecture, and the

gastronomy (美食). Barcelona has commercial areas and shopping areas of five kilometers that goes around

to the sea to the north. You can also see our architecture, our monuments, our museums, and our restaurants.

So there is a mix between shopping and services.

     One label that's hot among fashion consciousness is MIRO, and these trendy designs of clothing and shoes

originate in Barcelona. The region itself now produces for other international labels, like for the Gallic giant

Lacose.

     No visit to the city would be complete without a tour of the Nou Camp, the home of one of Spain's finest

teams, Barcelona Football Club. FC Barcelona was founded in 1899 along with the other Spanish team, Real

Madrid. It's one of the greatest football teams in Europe. With players like Maradona and Ronaldo having

played for Barca, it's easy to explain their success! FC Barcelona is known to have won more cups than any

other team in European football history. The stadium, the Nou Camp, can hold one hundred and twelve

thousand people, making it one of the greatest places to watch and play "the beautiful game".

1. This passage is most probably taken from _____. [ ]

A. a history book

B. a government document

C. a geography book

D. a travel book

2. The first paragraph is mainly about the _____ of Barcelona. [ ]

A. history

B. famous buildings

C. big events

D. present

3. Who is believed to have greatly affected the image of Barcelona? [ ]

A. Antony Caudy

B. The great Barker family of ancient Carpage

C. The King and Queen of Spain

D. The Romans

4. Which of the following is NOT among the attractions of Barcelona? [ ]

A. Culture

B. Sports

C. Architectures

D. Theatres

5. In the last paragraph, the author intends to _____. [ ]

A. highly praise Barcelona Football Club

B. tell us the development of FC Barcelona

C. tell us how to end our tour in Barcelona

D. tell us the great success of Spanish football

下列关于文件系统当前目录的叙述中，哪个是不正确的______。

A．每个用户可以有一个当前目录

B．引入当前目录可以加快检索速度

C．查找文件时可以使用部分路径名

D．当前目录不能随意改变