Cho tam giác ABC.Tìm tập hợp điểm M sao cho /vecto MA+3MB-2MC/ =/2MA-MB-MC/

Tìm phần bù của các tập sau trong tập R

a,A=[-12;10)

b,B=(-∞ ;-2) (2;+∞ )

c,C={x∈ R, -4<x+2≤ 5}

TÌm AʊBʊC biết A=(-∞;-2], B=[3;+∞), C=(0;4)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 30 to 34.

Tourism and Heritage Protection Travelling is a great thing to do. It helps us learn about different people and different places. Some people travel because they want to see nature. Others travel because they want to make friends and try great food. Of course, a lot of tourists are interested in traditional culture.

Tourism can be very good for traditional cultures. This is because when people travel to another country, they often want to learn more about that country’s traditions, such as music, food, and history. Therefore, the local people in that country will keep their traditional culture alive. They will wear traditional clothing, and sell traditional food. They will also have shows for tourists. These shows can be dances, concerts, plays, or something else.

Tourism also helps people respect each other. If you understand another culture well, you will probably respect that culture much more. You will probably want to protect that culture as well. However, tourism is not always good for traditional culture. Many people say that tourism creates “fake traditional culture”. This means that the local people wear traditional costumes, and do traditional dances only for tourists, but that is not their real lifestyle. Their real lifestyles are similar to the tourists’ lifestyle. They are just pretending because they want to make money.

What is the main point of the passage?

A. Tourism is always good for traditional culture. 

B. Tourism is always bad for traditional culture. 

C. Tourism can be good and bad for traditional culture. 

D. Tourists don’t care about traditional culture.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 23 to 27. Fill in the appropriate word in question 27

  We are all too well aware that the extinction of animal and plant species is one of the biggest and most horrifying threats (23) _____________ our planet these days. Having said that, there has recently

been some good news out of Russia regarding something called regeneration - a(n) (24) _____________ solution to this ever-growing problem.

  Regeneration involves (25) _____________ tissue from a plant or animal that has become extinct and ‘bringing it back to life’. In recent Russian experiments, scientists took fruit and seeds from the underground burrow of a long-dead Siberian squirrel and process to regenerate a beautiful flower called the Silene stenophylla. To date, it is the oldest plant to be produced from the innovative regeneration (26)____________  

  Understandably, experts are over the moon about their success as it shows once and for all that tissue can survive ice conservation for thousands of years. Those who participated in the regeneration of the flower are pleased and are now hoping to find prehistoric squirrel tissue or perhaps even (27) _____________ tissue from the great woolly mammoth, which could lead to the resurrection of those two species.

[From: STARLIGHT 8, Workbook, Express Publishing. 2010]

A. icy

B. freezing

C. iced

D. frozen