方钻杆两端均为左螺旋细螺纹。（）

Have you ever been to London? How much do you know about London? Now let me tell you.

London has a population of about 7, 000, 000. From about the year 1800 to 1945, London was the biggest city in the world. But now many cities are even bigger than before.

London is famous for many things. Tourists come from all over the world to visit its famous buildings and listen to the famous clock, Big Ben.

Like many big cities, London has problems such as traffic and pollution, and they stop the city from developing. Every day about 1, 000, 000 people come and go by underground, but there are still too many cars and buses in the streets. So the air isn’t clean. However, it is cleaner than it was 100 years ago.

For me, the best things in London are the parks. There are five parks in the city centre. But my children’s favourite place is Hamleys, the biggest toy shop in the world.

小题1:Maybe London became the biggest city in the world in______.

A．1750

B．1850

C．1950

D．1980小题2:What does the underlined word “underground” mean?

A．Ship.

B．Car.

C．Subway.

D．Taxi.小题3:What are the best things in London for the writer?

A．Famous buildings.

B．Parks.

C．Cars and buses.

D．Toys.小题4:---What’s Hamleys in London according to the passage?  ---It’s a______.

A．toy shop

B．museum

C．park

D．clock小题5:Which of the following sentences is NOT TRUE? ________.

A．London has a population of about 7, 000, 000

B．London is famous for buildings and Big Ben

C．The traffic in the city is easy because of the underground

D．The air in London is cleaner than 100 years ago

读图回答下列问题。

（1）图中省份：

A_______省；B_______省；C_______省；D_______省；E_______省

（2）ABCDE五省中，人口密度最小的是_________，有两个简称的是_________，人口超过5000万的省是________，与直辖市相邻的省是_________。（都填省名）

（3）少数民族最多的省区是________。

（4）图中五省中，不与我国自治区相邻是省是________。

（5）谜语“碧波万顷”是指图中五省中的哪个省？_________。

（6）“两湖两广两河山”中藏着我国8个省的名称，图中五省中有哪几个？______________________。（写省名）

国民党一大标志国共合作形成， * * 党以个人身份加入国民党，实现国共合作的决定是在( )。

A．中共一大

B．中共二大

C．中共三大

D．中共四大

重整径向反应器装填催化剂时，反应器下部瓷球高度不能高于中心管下端开孔线的原因是（）。

A、防止装填不均匀

B、防止催化剂装填过多

C、防止堵塞中心管

D、防止一部分油气走短路

我国发展对外经济关系必须坚持（）

A.以“引进来”为主的原则

B.以“走出去”为主的原则

C.独立自主、自力更生的原则

D.非歧视性原则