空气中引起温室效应的主要气体是（ ） A．氧气 B．氮气 C．二氧化碳 D．水蒸

()年，丁日昌派电报学堂学生苏汝灼、陈平国勘测台湾府城至旗后、至安平的电线线路，后来架设了电线。

A、1873

B、1877

C、1878

D、1880

已知某一导体两端的电压为6V时，通过它的电流为0.2A，则导体的电阻为______Ω，若电压为零时，导体的电阻为______Ω．

根据短文回答问题。

    Pets are a part of people's lives. Some pets are like family. In these days, many people have pets at

home and spend a lot of money improving their lives. In fact, in some parts of the word, pets get real

VIP treatment (待遇). VIP usually means Very Important People, but here VIP means Very Important

Pets!

    When you want to give Fido or Kitty a holiday, or when you are going away on business, you can

exercise inside or outside, and cats have a large place with something to climb on and play with. The

guests get the best food during their stays at these hotels.

    There are other special services at these hotels. Imagine you are traveling and you want to see your

pet: the hotel can put a video camera in the pet's room. So you can see you Fido or Kitty on TV.

    The hotels usually have good groomers (美容师): They often bath and take the best hair care for the

pets. But you need to make an appointment because people are usually very busy taking care of pets.

1. What's the new meaning of "VIP" in this passage?

2. According to this passage, where can you put your pet when you are away on business?

3. What does "Fido" stand for (代表) here? 

4. How can you see your pet during your traveling? 

5. Why need you make an appointment when you want a good groomer for your pet? 

7150灭火器主要用来扑救（）

A.气体火灾

B.液体火灾

C.轻金属火

（）可用来生产酚醛树脂。