Taking away a city’s rubbish is a big job. Every day trucks come into a city to collect it. Most rubbish is made up of things we can’t eat or use. If we kept these things we would soon have a mountain of rubbish.

In some cities the rubbish is collected and taken outside of city to a dump (堆存处). Often the city dump is placed where the ground is low or there is a big hole. The kitchen rubbish is broken into small pieces and sent into the sewage system. The sewage system takes away the used water from toilets, bathtubs and other places.

To keep mice and flies away, some earth is used to cover the newly dumped rubbish. Later, grass may be planted on the rubbish-filled land. Finally, a house or a school may be built there, and then you’d never know that this had once been an old rubbish dump.

In other cities the rubbish is burnt in special places. The fire burns everything but the metal. Sometimes the metal can be used again in factories where things are made of metal. The food parts of rubbish are put in special piles (堆) where they slowly change into something called humus (腐殖质), which looks like black earth. It is rich with kinds of things that feed plants and help them grow.

（ ）46.You can most probably read the passage on 　　　 .

A.an advertisement(广告)　 B.a poster　 C.a science book　 D.a story book

（ ）47.The main idea of the passage is 　　　　 .

A. to let us know taking away rubbish is a big job

B. to explain the need for rubbish collection

C. to introduce different ways to treat rubbish

D. to tell us rubbish does great harm to human beings.

（ ）48.The underlined word “sewage” in the passage means 　　　 .

A.排污　 B.洗涤　 C.吸尘　　 D.过滤

（ ）49.According to the passage, the food parts of rubbish can be used again 　　 .

A.To feed animals　 B. to feed plants　 C. to build a house　 D. to make electricity

（ ）50.How should we deal with a used metal box according to the passage?

A. By burning it off. B. By throwing it off.

C. By reusing and recycling it. D. You can do with it at any way.

Read the passage and fill in the blanks with proper words. (14分)

         You know that eating a sensible diet and getting plenty of exercise help make your body healthy and strong. But do you know that there are ways to make your brain healthier and smarter? Here are seven steps toward a smarter brain.

Limit your TV viewing

Never spend too much time on TV viewing, for it n__1.__ very little brain activities. Your brain will become weak just as your muscles do. If you do watch TV, choose something educational and meaningful.

Travel

Travelling to a____2.__ country forces you to see and do things in a fresh way, bringing stimulation to the brain. Learn a new language

Learning a new language involves different learning methods. Learning a language sharpens your brain and helps prevent memory p___3.___ that you may meet in later years.

Read often

As you read, take the time to look up people or places that aren’t familiar. Reading makes your vocabulary much l___4.__ if you always search for words and definitions that you don’t know. Each week, choose an animal, a bird or fish, and read everything you can about it. Stretch your brain as you become an expert on the subject.

Calculate w_____5.___ you shop

As you put things in your grocery cart, total everything in your head. See how close you get to the actual total.

Use your non-dominant（不占优势的）hand

If you are right-handed, use your left hand for everyday activities, or use your right hand if you are left-handed. Doing familiar things in a different way will make your brain c____6.__ new neural （神经）networks.

Wechat（微信）!

Read messages from people who has different interests. And some say that learning to express y____7.___ in just 100 words is a great brain challenge.

Have a try and do these every day. Little by little you can get into the habit of challenging your brain, and make your brain smarter!

When you are in Hongkong, you must be very careful in the streets because the traffic drives on the left. It is different from that in other areas of China. If you are the first time to come to Hongkong, you must look to the right side and then the left before you cross the street.
If the traffic lights are red, the traffic must stop. Then people on foot can cross the road carefully. But if the traffic lights are green, the traffic can go. People on foot mustn't cross.
When people go to or come from work in the morning and evening, the streets are very busy. Traffic is the most dangerous then, especially for the children.
When you go by bus in Hongkong, you have to be careful, too. You must always remember the traffic moves on the left. So you must be careful. Have a look first, or you will go the wrong way.
In Hongkong, there are many big buses with two floors you can sit on the second floor. From there you can see the view of the whole citywell. It's very interesting.
Read the passage and mark (T) for True or (F) for False to each statement.（ 阅读短文，判断正（T）误（F）。）
【小题1】The traffic in Hongkong drives on the right.
【小题2】The traffic in Hongkong is the same as that in other areas of China.
【小题3】If the traffic lights are green, the traffic can go.
【小题4】You can sit on the first floor and see the view of the whole city.
【小题5】According to the passage we know we must obey the traffic rules in Hongkong.