选用垫片的材料和类型时应考虑：被密封介质的腐蚀性，被密封介质的压力和温度，操作的平稳
题型：判断题
问题：
选用垫片的材料和类型时应考虑：被密封介质的腐蚀性，被密封介质的压力和温度，操作的平稳性。
题型：判断题
阅读理解
To see the world is one thing；to have someone to share it with is another.Indeed, travel becomes
more interesting when you have a travel partner.A travel partner can be a close friend, a family member,
a pal you've met online, or a business friend.
You can have someone to talk to
Traveling alone is fun, but wouldn't you feel lonely?Having a travel partner can remove the feeling of
loneliness.This is especially true if you can get a travel companion who is very familiar with the place
you're traveling to.You don't have to ask any information from the locals, and you can increase the time
you spend in the country.
____________________
One of the major headaches in traveling is the costs involved.You can't simply ignore the rising price
of hotels or plane tickets.You should also think about your daily needs, such as your food.Of course, you
can't simply 
go back without bringing any souvenirs (纪念品) to your friends and family.All these can ruin your budget.However, when you have a travel friend, you can have someone to share the expenses with.
You can meet a good friend
Having a travel mate is a good way of meeting a new friend or even a lifelong partner.You can never
count the number of couples who actually found their way into each other's heart while traveling together
in another country.
You can have someone to watch out for you
When you're in a foreign land, you'll never be really safe.You don't know the rules as well as the
culture of the people.A travel mate will be perfect to remind you of your duties in the country and to
watch your back just in case you get lost.So why don't you find a travel companion now?
Let's find out how ...
1. What's the author's purpose in writing this passage?
A. To introduce a travel company.
B. To encourage us to have a travel partner.
C. To explain how to be a perfect travel partner.
D. To tell an interesting experience with a travel partner.
2. What's the best title for the 3rd paragraph?
A. You can have someone to share the expenses with.
B. You can know the local culture well.
C. You can enjoy food with your partner.
D. You can save money by bargaining together.
3. Which of the following statements agrees with the author's opinion?
A. Traveling alone is not fun.
B. Buying souvenirs isn't necessary.
C. Many people fall in love when traveling.
D. It's better to choose a stranger as a travel partner.
4. Which of the following things is NOT mentioned?
A. A travel partner can help you take care of your child.
B. A travel partner can help get rid of loneliness.
C. A travel partner can help you save money.
D. A travel partner can make you safer.
5. The following paragraph will probably talk about________.
A. how to get along with a travel partner
B. how travel can benefit people
C. what we can learn from travel
D. how to find a travel partner