All living things on the earth need other living things to live on. Nothing lives alone. Most animals must live in a group, and even a plant grows close together with others of the same kind. Sometimes one living thing kills another, one eats and the __①__    is eaten. Each kind of life eats another kind of life in order to live, and together they form a food chains(链子). Some food chains are simple, while others are not. But all food chains begin with the sun, ② and all food chains become broken up if one of the links(连接) disappears.

All life needs sunlight to live on. But only plants can use sunlight directly (直接地). Plants are “factories”. They make food from sunlight, water and things in the soil and air.

Plants feed all other living things. Animals can only use the sun’s energy after it has been changed into food by plants. Some animals feed directly on plants, others eat smaller animals. Meat-eating animals are only eating plants indirectly(间接地).

What about human beings（人类）? We are members of many food chains. We eat wheat, rice, vegetables, fruits and so on. We also eat meat and drink milk. But men often break up the food chains. They kill wild animals and make the rivers, lakes, and seas dirty. When these rivers, lakes and seas are polluted, the fish in them cannot be eaten. If men eat the fish, they will get strange diseases(疾病).

Each form (形式, 方式) of life is linked to all the others. Breaking the links puts all life in danger.

71、在①句的空白处填入适当的词使句意完整、上下文通顺。______________

72、将②句译成中文。                                                  

73、What do plants make food from?

74、在文中找出与下面意思相近的句子并写在下列的横线上。

Human beings often break the balance of nature.

75、找出文中或写出最能表达该短文主题的句子。

从A、B、C、D中选出与句中划线部分意义最接近的词语。

My house is very close to Li Ming's.　　

[　　]

A. behind  B. next to  C. near  D. beside

从A、B、C、D中选出与句中划线部分意义最接近的词语。

The cinema is next to our block.

[　　]

A. behind　　B. close to　　C. beside　　D. near

To many students, joining social media (社交媒体) “circles” is now more important than making new friends in real life.
And it’s easy. If you have a cell phone, you can download apps (应用程序) such as Sina Weibo, WeChat (微信) and QQ.
“I love to check my friends’ updates (更新). I also enjoy news and humor shared on social media,” Said Ou Wei, 14, from Hongling Middle School in Shenzhen. Because of enjoying these, Ou distances himself from real life. “I love playing the plane-shooting game on WeChat, but have no interest in playing flying chess with my classmates,” said Ou.
Deng Yunyun, 14, from Jianfeng Middle School in Shanghai, said that social media had influenced their life. Recently his school held a basketball match, and a student hurt his leg. Instead of giving him some help, students were busy with updating micro blogs about the accident.
“I think they need to learn to balance their real and online lives,” said Deng,
What makes parents and teachers worried is safety. “Many students are happy to tell their interests and personal information to their social media “friends”. Such information could bring them danger,” said Han Songjun, a teacher at Hongling Middle School.
For example, WeChat’s shake-shake function allows users to connect to other users close by. But the police warn about the danger of socializing in this way.
“Be careful. Do not use the locating (定位) function in any app, do not give your name, and do not post the photos of your residential area (小区),” said the police.
【小题1】 What is the possible meaning of the underlined word “distances” in Paragraph 3?