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 1 to 8.

As heart disease continues to be the number-one killer in the United States, researchers have become increasingly interested in identifying the potential risk factors that trigger heart attacks. High-fat diets and "life in the fast lane" have long been known to contribute to the high incidence of heart failure. But according to new studies, the list of risk factors may be significantly longer and quite surprising.

Heart failure, for example, appears to have seasonal and temporal patterns. A higher percentage of heart attacks occur in cold weather, and more people experience heart failure on Monday than on any other day of the week. In addition, people are more susceptible to heart attacks in the first few hours after waking. Cardiologists first observed this morning phenomenon in the mid-1980, and have since discovered a number of possible causes. An early-morning rise in blood pressure, heart rate, and concentration of heart stimulating hormones, plus a reduction of blood flow to the heart, may all contribute to the higher incidence of heart attacks between the hours of 8:00 A.M. and 10:00 A.M.

In other studies, both birthdays and bachelorhood have been implicated as risk factors. Statistics reveal that heart attack rates increase significantly for both females and males in the few days immediately preceding and following their birthdays. And unmarried men are more at risk for heart attacks than their married counterparts. Though stress is thought to be linked in some way to all of the aforementioned risk factors, intense research continues in the hope of further comprehending why and how heart failure is triggered.

What does the passage mainly discuss?

A. risk factors in heart attacks

B. seasonal and temporal patterns of heart attacks 

C. cardiology in the 1980s

D. diet and stress as factors in heart attacks

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. Fill in the appropriate word in question 36

Wind, water, air, ice and heat all work to cause erosion. As the wind blows over the land, it often (33)_______ small grains of sand. When these grains of sand strike against solid rocks, the rocks are slowly worn away. In this way, (34)_______ very hard rocks are worn away by the wind.

When particles of rocks or soil became loosened in any way, running water carries them down the hillsides. Some rocks and soil particles are carried into streams and then into the sea.

Land that is covered with trees, grass and other plants wear away very slowly, and so loses very (35)_______ of its soil. The roots of plants help to hold the rocks and soil in place. Water that falls on grasslands runs away more slowly than water that falls on bare ground. Thus, forests and grasslands help to slow down erosion.

Even where the land is (36)_______ covered with plants, some erosion goes on. In the spring, the melting snow turns into a large quantity of water that then runs downhill in streams. As a stream carries away some of the soil, the stream bed gets deeper and deeper. (37)_______ thousands of years of such erosion, wide valleys are often formed.

A. thickly

B. scarcely

C. thinly

D. strongly

Cho biết chất nào thuộc polisaccarit: 

A. Glucozơ

B. Saccarozơ. 

C. Mantozơ.

D. Xenlulozơ

Thuốc thử dùng để phân biệt 3 dung dịch  H 2 SO 4 loãng,  Ba ( OH ) 2 , HCl  là

A. Cu.

B. dung dịch  BaCl 2 .

C. dung dịch  NaNO 3 .

D. dung dịch NaOH.

Khi đốt cháy hoàn toàn m gam hỗn hợp hai ancol no, đơn chức, mạch hở thu được V lÝt khí CO₂ (ở đktc) và a gam H₂O. Biểu thức liên hệ giữa m, a và V là:

Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions

A. economy 

B. society 

C. necessity 

D. facility

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of the primary stress in each of the following questions

A. history 

B. confide 

C. result 

D. suggest

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.

The ideas of John Dewey, philosopher and educator, have influenced American thought for over one hundred years. Dewey was born in Vermont in 1859, and throughout his life, he kept the respect for experience, individuality, and fair play that shaped the character of the nineteenth–century Vermonter. He viewed his own life as a continuously reconstructive process–with experience and knowledge building to each other.

By the 1930s, Dewey had simplified his theory of experience to its essence. As the intellectual leader of the progressive schools, he asserted that there was danger in rejecting the old unless the new was rooted in a correct idea of experience. He held that experience is an interaction between what a person already knows and the situation at hand. Previous knowledge interacting with the present environment influences future experience.

Dewey believed that experience could not be equated with education because all experiences are not necessarily educative. Experience is educative only when it contributes to the growth of the individual, but it can be miseducative if it distorts the growth of future experience. It is the quality of experience that matters. Thus, productive experience is both the means and the goal of education. Furthermore, since education is a social process, truly progressive education involves the participation of the learner in directing the learning experience.

During his long life, Dewey lectured and published prolifically. These writings were influential both during his lifetime and after his death at the age of ninety–two. He viewed his whole life as an experiment which would produce knowledge that would lead to the further experimentation. The range and diversity of Dewey’s writings and his influence on society place him among American’s great thinkers.

The word “distorts” in paragraph 3 is closet in meaning to _____.

A. balances

B. deforms

C. mislays

D. stimulates

Có bao nhiêu biện pháp sau đây góp phần sử dụng bền vững tài nguyên rừng?

(1) Thay thế dần các rừng nguyên sinh bằng các rừng thứ sinh có năng suất sinh học cao.

(2) Tích cực trồng từng để cung cấp đủ củi, gỗ cho sinh hoạt và phát triển công nghiệp.

(3) Tránh đốt rừng làm nương rẫy.

(4) Xây dựng hệ thống các khu bảo vệ thiên nhiên.

(5) Xây dựng các nhà máy thủy điện tại các rừng đầu nguồn quan trọng.

A. 2

B. 3

C. 4

D. 5