解方程：（1）4x-3（5-x）=2（2）x-x-25=2x-53-3．

阅读对话，回答下列问题。

Salesman: Good morning. Can I help you?

Tom: Yes, please. I want a sweater.

Salesman: This one is nice. Do you like it?

Tom: Oh, it's orange. I don't like the colour.

Salesman: How about that one?

Tom: Oh, how nice! I just want a blue one. How much is it?

Salesman: Sixty yuan.

Tom: OK! I'll buy it. Here's the money. Thank you.

Salesman: It's my pleasure. Goodbye!

1. Where is Tom?

_____________________________________________________

2. What does he want?

_____________________________________________________

3. What colour does he like?

_____________________________________________________

4. How much is the sweater?

_____________________________________________________

5. What colour do you like?

_____________________________________________________

催化重整装置废水的主要污染物是（）。

A.酚

B.硫化物

C.氰化物

D.油

有机物分子中最多有多少个原子共面  [ ]

A．12

B．16

C．20

D．24

C

Americans use more water than any other people in the world. If we continue to use water at the rate we do now, we will soon not have enough to meet our needs. In 1980, 40 billion gallons were used each day in the United States. In 1990, 700 billion gallons were used. The average Americans use almost 90 gallons of water a day for personal use. And much move water is needed to make the things American people like to have. For example, it takes thousands of gallons of water to make one pound of beef for the dinner table. It takes more than 100000 gallons of water to make a car. If we include these uses of water, the average American uses about 2000 gallons of water a day．

What is the author’s opinion ( )

A．Americans don’t have enough water.

B．Americans don’t use enough water.

C．Americans like to use water.

D．Americans use too much water.

电缆中间接头参数哪些是必填项？