瓷器和茶叶是我国古代的发明并称著于世，请探讨一下它们的发展过程。

Modern life is impossible without traveling. The fastest way of traveling is by plane. With a modern airline you can travel in one day to places which it took a month or more to get to a hundred years ago.

Traveling by train is slower than plane, but it has its advantages. You can see the country when you are traveling through. Modern trains have comfortable seats and dining cars. They make even longer journey enjoyable.

Some people prefer to travel by sea when possible. There are large liners and river boats. You can visit many other countries and different places. And traveling by sea is a very pleasant way to spend a holiday.

Many people love to travel by car. You can make your own timetable. You can travel three or four hundred miles or only fifty or one hundred miles a day, just as you like,You can stop wherever you wish where there is something to see, at a good restaurant where you can enjoy a good meal, or at a hotel to spend the night. That’s why travelling by car is popular fpr pleasant trips,while people usually take a train or plane when they are travelling on business.

小题1: From the passage we know the fastest way of travelling is _______.

A. by train     B, by sea      C. by plane

小题2:The underlined word “they” in the 2^nd paragraph refers to _____.

modern trains in the country

comfortable seats and dining cars

the travellers on the modern trains

小题3: If we travel by car, we can__________.

make the longer journey enjoyable

travel to a very far place in several minutes

make our own timetable

小题4:When people travel on business , they usually take ______.

a plane or a car

a train or a plane

a boat or a train

小题5:How many ways of travelling are mentioned in the passage ?

A.  Four      B. Three      C. Two

若大气中水蒸气的容积百分比占有25%，大气压强为101.3kPa，则水蒸气压为（）

A.1.26kPa

B.5.OOkPa

C.3.52kPa

D.0.63kPa

E.2.OkPa

⑴写出下列各物质的化学式：①干冰      ，②最轻的气体          ，

③空气中含量最多的气体       ，④地壳中含量最多的元素和金属元素组成的化合物       

⑵写出下列化学符号： ①2个钠离子      ，②3个氢原子     ，③8个二氧化碳分子     

④四个氢氧根离子            。

⑶写出下列数字“2”表示的意义：①Mg²⁺            ，②H₂O           。

"生痰之源"指的是( )

A．肺

B．肝

C．脾

D．肾

E．心

血清铁降低，总铁结合力增高（）

A.再生障碍性贫血

B.慢性感染性贫血

C.溶血性贫血

D.缺铁性贫血

E.铁粒幼细胞贫血