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.

Basic to any understanding of Canada in the 20 years after the Second World War is the country's impressive population growth. For every three Canadians in 1945, there were over five in 1966. In September 1966, Canada's population passed the 20 million mark. Most of this surging growth came from natural increase. The depression of the 1930s and the war had held back marriages, and the catching-up process began after 1945. The baby boom continued through the decade of the1950s, producing a population increase of nearly fifteen percent in the five years from 1951 to 1956. This rate of increase had been exceeded only once before in Canada's history, in the decade before 1911 when the prairies were being settled. Undoubtedly, the good economic conditions of the 1950s supported a growth in the population, but the expansion also derived from a trend toward earlier marriages and an increase in the average size of families. In 1957 the Canadian birth rate stood at 28 per thousand, one of the highest in the world.

After the peak year of 1957, the birth rate in Canada began to decline. It continued falling until in 1966 it stood at the lowest level in 25 years. Partly this decline reflected the low level of births during the depression and the war, but it was also caused by changes in Canadian society. Young people were staying at school longer; more women were working; young married couples were buying automobiles or houses before starting families; rising living standards were cutting down the size of families.

It appeared that Canada was once more falling in step with the trend toward smaller families that had occurred all through the Western world since the time of the Industrial Revolution. Although the growth in Canada's population had slowed down by 1966 (the increase in the first half of the 1960's was only nine percent), another large population wave was coming over the horizon. It would be composed of the children who were born during the period of the high birth rate prior to 1957.

The word "five" in the first paragraph refers to__________________. 

A. decades 

B. marriages 

C. years 

D. Canadians

Trong không gian Oxyz, cho biết có hai mặt cầu có tâm nằm trên đường thẳng d:  x 2 = y - 1 1 = z + 2 - 1 , tiếp xúc đồng thời với 2 mặt phẳng:  ( α ) : x+2y-2z+1=0 và  ( β ) : 2x-3y-6z-2=0. Gọi  R 1 ,   R 2   ( R 1   > R 2 )  là bán kính 2 mặt cầu đó. Tỉ số  R 1 R 2  bằng

A.  2

B. 3

C. 2

D. 4

Cho các chất hữu cơ mạch hở: X là axit không no có hai liên kết π trong phân tử, Y là axit no đơn chức, Z là ancol no hai chức, T là este của X, Y với Z. Đốt cháy hoàn toàn a gam hỗn hợp M gồm X và T, thu được 0,1 mol CO₂ và 0,07 mol H₂O. Cho 6,9 gam M phản ứng vừa đủ với dung dịch NaOH, cô cạn dung dịch sau phản ứng thu được hỗn hợp muối khan E. Đốt cháy hoàn toàn E, thu được Na₂CO₃; 0,195 mol CO₂ và 0,135 mol H₂O. Phần trăm khối lượng của T trong M có giá trị gần nhất với giá trị nào sau đây? 

A. 68,7.

B. 68,1.

C. 52,3

D. 51,3.

Read the following passage and mark the letter A,B,C,D on your answer sheet to indicate the correct word for each of the blanks.

Around 200 million people are employed in tourism worldwide, making it the largest industry in the modern global economy. It is estimated that three-quarters of a billion people (35)___________ on holiday each year, and industry planners expect this figure to double by 2020. Some of the biggest beneficiaries are less developed countries, (36)___________it is often their main source of income. (37)_________________, along with the economic benefits, this mass movement of people has resulted in threats (38)_____________ the environment. People often forget the damage caused by carbon dioxide emissions from aircraft, which (39) ______________ directly to global warming. Deforestation has cleared land in order to build hotels, airport and roads, and this has destroyed wildlife. In some areas, water shortages are now common (40)_____________of the need to fill swimming pools and water golf courses for tourists. By pushing up prices for goods and services, tourism can also be (41)______________ to the people who live in tourist destinations.

In response to these concerns, some travel operators now offer environmental friendly holidays. Many of these aim to reduce the negative (42)____________ of tourism by promoting only hotels that have invested equipment to recycle waste and use energy and water efficiently. Increasingly, tourists are also being reminded to show respect (43)______________ the customs of the people (44) ______________countries they are going to visit, and to support local businesses, such as restaurants and shops, which depend on tourism for their main income.

Điền vào ô số 37

A. Therefore 

B. Although 

C. However 

D. Furthermore 

Hỗn hợp X gồm 2 este no, đơn chức, mạch hở. Cho 0,25 mol X tác dụng với dung dịch AgNO₃ trong NH₃ dư, đun nóng thu được 21,6 gam Ag. Mặt khác, cho 14,08 gam X tác dụng với dung dịch NaOH vừa đủ thu được hai muối của hai axit cacboxylic đồng đẳng kế tiếp và 8,256 gam hỗn hợp hai ancol no, đơn chức, mạch hở, đồng đẳng kế tiếp. Thành phần phần trăm khối lượng của 2 este là

A. 80% và 20%.

B. 30% và 70%.

C. 40% và 60%.

D. 32,6% và 67,4%.

Dùng ít nhất bao nhiêu phản ứng để tách anilin khỏi hỗn hợp 3 chất anilin, phenol và benzen

A. 2                       

B. 3                        

C. 1                        

D. 4