Is the world too crowded? Well, that’s a hard question to answer. It’s all a matter of perspective(视角).In Montana, you might drive for a mile in any direction and not see another human being. In Macao, 60,000 people live in every square mile!
What is true is that the world’s population doesn’t stay the same. It has been increasing at a very fast rate(比例).That’s in part because in each generation(代) these are more people who then have children than in the last generation.
Five hundred years ago, the population of the world was about 460 million. In 1900,the world’s population was under 2 billion(十亿).Right now it is doubling every 40 years. That means, if this rate of growth continues, when you are a parent, there will be twice as many people on earth as there are now. Wow! Now that’s a whole lot of people! Soon the world’s population will probably reach 7 billion. Some people worry about that! But there is a lot of disagreement about just how many people on earth equals(相当于) too many people. But everyone agrees that the more people there are, the more resources(资源) the world needs to feed, house and take care of all of them, and the more need there is to think carefully about how we live and use the earth’s resources.
【小题1】From the first paragraph we can know that ­________.

Everyone needs friends. We all like to feel close to someone. We can share 1.s       with our friends and turn to them for help when we are in trouble. In a word, it is nice to have a friend to 2.t      , laugh and do things with. Certainly, sometimes we need to be alone. We don’t always want people around. But we would feel 3.l       if we never had a friend.

To make 4.f      , you must be friendly. A cheerful person smiles. A smile always makes the others like you. Smile at someone and you are sure to get a smile5.b       from him.

Try to remember names. It6.m       your new friends feel happy when you call them by their names, 7.b       you don’t forget them.

No two people are just the same. If you don’t agree with other people, you should still be friendly. Do not argue, but 8.d      . You always lose friends if you argue too much. And you should think more of others than 9.o       yourself. It’s good for teenagers to have one or a group of good friends. This is very 10.i       in children’s growing up, because friends can discuss things which are too difficult to say to their family members.

There’s more good news for people who have friends. They live 11.l       than people who don’t have. Why? It could be that they12.a       happier. Being happy helps you stay well and it could be good just knowing that someone cares about you.

根据下列句子及所给单词的首字母，在答题纸上按题号写出各单词的完全形式（每空限填一词）。

71. She noticed a little dog l_____ on the ground, dead. 

72. He s________ in solving the problem after practicing many times.

73. John likes to do things d_________ from others.

74. The women’s ages are s________ in America. If you ask a woman’s age, it’s impolite.

75. The young man doesn’t depend on his parents. He learns to live on his o____.

76. My next door n________ often help me take care of my baby.

77. I was forty-nine last year. But today is my f______ birthday. 

78. Jimmy joined the army in 2008. Now he has been a nice s________.

79. The death of the emperor Kangxi r________ a mystery.

80. I do outdoor activities every day u_____ bad weather stops me.