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.

The technology of the North American colonies did not differ strikingly from that of Europe, but in one respect, the colonists enjoyed a great advantage. Especially by comparison with Britain, Americans had a wonderfully plentiful supply of wood.

The first colonists did not, as many people imagine, find an entire continent covered by a climax forest. Even along the Atlantic seaboard, the forest was broken at many points. Nevertheless, all sorts of fine trees abounded, and through the early colonial period, those who pushed westward encountered new forests. By the end of the colonial era, the price of wood had risen slightly in eastern cities, but wood was still extremely abundant.

The availability of wood brought advantages that have seldom been appreciated. Wood was a foundation of the economy. Houses and all manner of buildings were made of wood to a degree unknown in Britain. Secondly, wood was used as fuel for heating and cooking. Thirdly, it was used as the source of important industrial compounds, such as potash, an industrial alkali; charcoal, a component of gunpowder; and tannic acid, used for tanning leather.

The supply of wood conferred advantages but had some negative aspects as well. Iron at that time was produced by heating iron ore with charcoal. Because Britain was so stripped of trees, she was unable to exploit her rich iron mines. But the American colonies had both iron ore and wood; iron production was encouraged and became successful. However, when Britain developed coke smelting, the Colonies did not follow suit because they had plenty of wood and besides, charcoal iron was stronger than coke iron. Coke smelting led to technologic innovations and was linked to the emergence of the Industrial Revolution. In the early nineteenth century, the former colonies lagged behind Britain in industrial development because their supply of wood led them to cling to charcoal iron

What does the passage mainly discuss?

A. The advantages of using wood in the colonies

B. The effects of an abundance of wood on the colonies

C. The roots of the Industrial Revolution

D. The difference between charcoal iron and coke iron

The heart has long been considered to be (31)………….feelings of love dwell. In love songs throughout the ages, love almost always goes together (32)…….the heart. The heart has continuously been viewed as the place where love begins and develops. Even the Bible gives preference to love and the heart.

The role of the heart in love must come from what happens to it when a person feels strongly (33)…….. to someone. The strong feelings (34)………the other person, especially in the early stages of a relationship, have the results that the heart starts beating faster and breathing starts speeding up.

According to psychologists, a love relationship is a situation that (35)………a lot of stress and the body reacts to this by getting ready to face the unknown. This has been called the "fight or flight" reaction, meeting danger by fighting it or running away. So with love, the heart accelerates and breathing becomes quick.

Điền ô số 34

A. of

B. to

C. with

D. for