Đề kiểm tra học kì

  Cho abc là ba điểm tạo thành một tam giác vuông tại A trong điện trường đều có véctơ cường độ điện trường song song với cạnh ac và có độ lớn E bằng 3.10^4 V/m có chiều như hình vẽ cho AB =AC =20cm .một hạt electron có điện tích -1,6 *10 ^-19 C dịch chuyển từ A đến B rồi từ Bđến C tính công của lực điện khi electron trong hai trường hợp trên

VII. Translate the following sentences into English.

1. Cần phải có những biện pháp hữu hiệu nhằm chống lại nạn nghiện hút đang tăng lên ở các trường đại học và cao đẳng. (effective, measures, take, against, drug-addition, increase, universities, colleges).

2. Chúng ta ngày càng nhận thứ rõ tầm quan trọng của môi trường đối với sự tồn tại và phát triển của con người. (become, aware, importance, existence, development).

V. Fill each blank with one suitable word. 

BEE KEEPING

Honey, the sweetest …1… natural foods, was the main source of …2… in ancient times. It was highly prized both as a foodstuff …3… a medicine, …4… those days, the art of bee keeping was known only …5… a select few members of secret societies, who were treated …6… great respect. Nowadays, of course, bee-keeping is not surrounded by such mystique. It is a popular pastime …7…can be taken up by anyone with a …8… money to spend and some space in their garden.

It …9… be wrong to say that bees are domestic creatures, farmed …10… the same way as cows or sheep. The beekeeper provides a home for the bees, and …11… care of them, but the bees …12… with. In a sense, the relationship …13… bee and beekeeper is one of mutual exploitation. Both benefit …14… the relationship, and …15… one is a slave to the other.

Many people …16… an irrational fear of bees. Their anxiety is usually based …17… an ignorance of …18… true nature of these adorable insects. They are not naturally aggressive creatures. True, their sting is rather painful, but it is seldom …19… serious for the victim as it is for the bee, who dies soon …20…

IV. Read the following passage and then decide whether the sentences are true or false according to the passage

Our planet Earth is one of nine planets revolving around the sun, a fairly small and ordinary star, which lies in the outer areas of the Milky Way Galaxy. There are about 250 billion stars in our galaxy, and billions of galaxy in universe. People have always wondered about the possibility of intelligent life forms on other planets. In recent years, this has become serious scientific speculation. Some scientists believe that there must be large numbers of stars with planets which could support living intelligent beings. Perhaps we shall never know. The nearest star is 4.3 light years away. A light year is the distance covered by light (travelling al almost 300,000 kilometers a second), in one year. It would take the fastest Earth spacecraft about 40,000 years to reach the nearest star. For a number of years radio telescopes have been trying to pick up signals from outer space, so far without success. There are, however, millions of possible radio frequencies, and there is no reason why a completely alien civilization should not use a different type of communication, such as X-rays or even a type of wave we have not yet discovered. Suppose contacts were made with beings 300 light years away. By the lime we had sent our reply, and received their response the earth would be 600 years older. It would be an interesting, but rather slow moving conversation!

1. Nine planets but the Earth move around the sun.

2. Scientists doubt if there is intelligent life on other planets.

3. It wouldn’t be possible for the very person who sent a message to even the nearest star to receive a reply from it.

4. The universe is immense.

5. We still haven’t received any signals from outer space.

I. Supply the correct form of the verb in brackets.

Hardly a week goes by without some advance in technology that …1… (seem) incredible 50 years ago. Over the past 20 years computers …2… (completely revolutionize) our lives. Yet we can expect the rate of change …3… (accelerate) rather than …4… (slow) down within our lifetimes. The next 25 years …5… (see) as many changes as …6… (witness) in the past 150 yeas. These developments in technology are bound …7… (have), a dramatic effect on the future of work. By 2010, new, technology …8… (revolutionize) communications. People …9… (transmit) messages down the telephone lines that previously …10… (send) by postal. A postal system which …11… (essentially be) the same since the Pharoahs …12… (virtually disappear) overnight. Once these changes …13… (introduce), not only postmen but also clerks and secretaries will vanish in a paper- free society. All the routine tasks they perform …14… (carry) on a tiny silicon chip. As soon as this technology is available, these people will be as obsolete as the horse, and cart after the invention of the motor car. One change …15… (make) thousands if not millions, redundant.

Rewirte

1: The psychologists who study the nature of sleep have made important discoveries. (Reduced relative clause)

2. John Quincy Adams, who was born on July 11th 1767, was the sixth president of the d United States. (Reduced relative clause)

3: Linda was the second student who answered this question correctly. (Reduced relative clause)

4: I never forget the garden. We met each other for the first time at this garden

5: Hans Lipperhey invented the telescope in 1608. He was a Dutch eyeglass maker. (combine to the sentences using Relative Clause)