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何谓同配性别和异配性别，在XX—XY和ZZ—ZW两种性别决定中有何不同？

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[A] Another
[B] One other
[C] Other
[D] Other one

教一学过程的三种过程是（）。

Why does the author mention gunpowder in Paragraph 3？
[A] To remind readers that the colonial era ended in warfare.
[B] To give an example of a product made from wood consumption.
[C] To illustrate some negative aspects of some industrial processes.
[D] To suggest that wood was not the only important product of the colonies.

Text 3
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 con-
tinuous forest. Even along the Atlantic seaboard, the forest was broken at many points. Neverthe- less, 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 un- known in Britain. Secondly, wood was used as a fuel for heating and cooking. Thirdly, it was used as the source of important industrial compounds, such as potash, an industrial alkali; char- coal, 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 technological 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.
56. Which of the following is a common assumption about the forests in North America during
the colonial period？
[A] Their economic value was little known.
[B] They contained only a few types of trees.
[C] They covered almost the entire continent.
[D] They existed only along the Atlantic seaboard.