Cho hình chóp S.ABC có SA ⊥ (ABC). Gọi H và K lần lượt là trực tâm của các tam giác ABC và SBC:

Đường thẳng HK vuông góc với mặt phẳng:

A. (ABC)

B. (BK’H’)

C. (ASG)

D. (SBC)

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions.

INTERNATIONAL GIFT-GIVING CUSTOMS

The tradition of gift giving is a worldwide practice that is said to have been around since the beginning of human beings. Over time, different cultures have developed their own gift giving customs and traditions.

In France, the gift of wine for the hostess of a dinner party is not an appropriate gift as the hostess would prefer to choose the vintage for the night. In Sweden, a bottle of wine or flowers are an appropriate gift for the hostess. In Viet Nam, a gift of whisky is appropriate for the host, and some fruit or small gifts for the hostess, children or elders of the home. Besides, gifts should never be wrapped in black paper because this color is unlucky and associated with funerals in this country. Gifts that symbolize cutting such as scissors, knives and other sharp objects should be avoided because they mean the cutting of the relationship. Also, in some countries you should not open the gift in front of the giver and in others it would be an insult if you did not open the gift.

Beyond the gift itself, give careful consideration to the manner in which it is presented. Different cultures have different customs regarding how a gift should be offered - using only your right hand or using both hands, for example. Others have strong traditions related to the appropriate way to accept a gift. In Singapore, for instance, it is the standard to graciously refuse a gift several times before finally accepting it. The recipient would never unwrap a gift in front of the giver for fear of appearing greedy.

Understanding these traditions and customs, as well as taking time to choose an appropriate gift, will help you to avoid any awkwardness or embarrassment as you seek to build a better cross-cultural relationship.

The phrase “associated with" is closest in meaning to ____.

A. connected with

B. familiar with

C. informed of

D. similar to

Ba mặt phẳng đôi một cắt nhau theo ba giao tuyến phân biệt. khẳng định nào sau đây là đúng?

A. ba giao tuyến này đôi một song song

B. ba giao tuyến này hoặc đồng quy hoặc đôi một song song

C. ba giao tuyến này đồng quy

D. ba giao tuyến này đôi một cắt nhau tạo thành một tam giác.

Khi đánh trống, tại sao người ta thường gõ dùi trống vào mặt trống một cách dứt khoát?

A. Để mặt trống có thể dao động ngay và tạo ra âm thanh

B. Để mặt trống không bị hỏng

C. Để mặt trống ít bị rung

D. Để mặt trống rung mạnh hơn

Cho các số phức z 1 = 1 + 2 i ,   z 2 = 3 - i .  Tìm số phức liên hợp của số phức w = z 1 + z 2

A.  w = 4 - i

B.  w = 4 + i

C.  w = - 4 + i

D.  w = - 4 - i

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 43 to 50.

It is commonly believed in the United States that school is where people go to get an education. Nevertheless, it has been said that today children interrupt their education to go to school. The distinction between schooling and education implied by this remark is important.

Education is much more open-ended and all-inclusive than schooling. Education knows no bounds. It can take place anywhere, whether in the shower or on the job, whether in a kitchen or on a tractor. It includes both the formal learning that takes place in schools and the whole universe of informal learning. The agents of education can range from a revered grandparent to the people debating politics on the radio, from a child to a distinguished scientist. Whereas schooling has a certain predictability, education quite often produces surprises. A chance conversation with a stranger may lead a person to discover how little is known of other religions. People are engaged in education in infancy. Education, then, is a very broad, inclusive term. It is a lifelong process, a process that starts long before the start of school, and one that should be an integral part of one's entire life.

Schooling, on the other hand, is a specific, formalized process, whose general pattern varies little from one setting to the next. Throughout a country, children arrive at school at approximately the same time, take assigned seats, are taught by an adult, use similar textbooks, do homework, take exams, and so on. The slices of reality that are to be learned, whether they are the alphabet or an understanding of the workings of government, have usually been limited by the boundaries of the subjects being taught. For example, high school students know that they are not likely to find out in their classes the truth about political problems in their communities or what the newest filmmakers are experimenting with. There are definite conditions surrounding the formalized process of schooling.

Question 47. The phrase “For example,” in paragraph 3, introduces a sentence that gives examples of.......

A. similar textbooks

B. the results of schooling

C. the workings of a government

D. the boundaries of the subjects