根据短文内容回答问题。

　　Which animals do we need most? Dogs? Cats? Horses? No! The answer to the question is cows!

　　Why cows? Cows give us milk．And milk is one of our most important foods．Suppose(假设)that all the milk cows make in one year was put into bottles, and suppose these bottles were set side by side, the line of bottles would go all around the world 400 times!

　　That is a lot of milk．Less than half of it is used for drinking and cooking．Most of it is used to make butter, cheese, ice-cream and many other things．

　　It takes many cows to give us that much milk．But not as much as it used to．A cow used to give only about 1, 500 quarts(夸脱)of milk a year．Now a fine cow may give more than 3, 000 quarts in a year!

　　Why do cows give more milk today? Farmers have better cows．The cows get better care and better food．For each two and a half pounds of grass that she eats, a fine cow makes about a pound of milk．But she may not give all the milk she makes．If she is unhappy, she may give only a small part of it．A cow is a friendly animal．If man is kind and speaks softly to her, she gives more milk．She also likes music．

　　Cows give us more than just food．Their skin can be made into shoes．No animal does more for us than cows．

1．Why do we need cows most?

_________________________________

2．How much of the milk is used for drinking and cooking?

_________________________________

3．What is the most of the milk used to do?

_________________________________

4．Why does a fine cow now give twice as much milk as a cow used to?

_________________________________

5．What will happen if we make cows unhappy?

_________________________________