阅读理解。
We can not live a modern life without traveling. The fastest way of
traveling is by air. With a plane people 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 by plane, but people can see the country
when they are traveling through. Modern trains have comfortable seats and
dinning-cars. They make even the longest journey(旅途) enjoyable．
Some people prefer to travel by sea when possible. There are large luxury
liners(客轮) or river boats. They are not as fast as trains or planes, but traveling
by sea is a very pleasant way to spend a holiday．
Many people like to travel by car. They can make their own timetable. They
can travel hundreds of miles or only fifty miles a day, just as their wish. They can
stop wherever they want to see something interesting or to enjoy a good meal at a
good restaurant, or to spend the night at a hotel. That is why people choose
traveling by car for pleasant trips, while they usually take trains or planes for
business．
1. According to(根据) the passage, the fastest way of traveling is _____.
A. by car
B. by train
C. by plane
D. by sea
2. People can make even the longest journey enjoyable if they take the _____.
A. train
B. plane
C. sea
D. bus
3. _____is a very pleasant way to spend a holiday．
A. Traveling by bike．
B. Traveling by train．
C. Traveling by sea．
D. Traveling by car.
4. If we travel by car, we can _____
A. enjoy the longest journey
B. travel only fifty miles a day
C. make our own timetable
D. travel to a very far place in a few minutes
5. When people travel on business, they usually take _____
A. a boat or a train
B. a car or a boat
C. a plane or a car
D. a train or a plane
，其间充满待测的导电溶液。用如下器材进行测量：电压表（量程l5 V，内阻约30
)、电流表（量程300
，内约
）、滑动变阻器（
，1 A）、电池组（电动势
，内阻
）、单刀单掷开关一个、导线若干。表1是他测量通过管中导电液柱的电流及两端电压的实验数据。实验中他还用游标卡尺测量了玻璃管的内径，结果如图2所示。
图象，根据图象求出电阻
（保留两位有效数字)；
Ωm（保留两位有效数字)。
