单选题 Every second, I hectare of the world's rainforest is destroyed. That's equivalent to two football fields. An area the size of New York City is lost every day. In a year, that adds up to 31 million hectares — more than the land area of Poland. This alarming rate of destruction has serious consequences for the environment. Scientists estimate, for example, that 137 species of plant, insect or animal become extinct every day due to logging. In British Columbia, where, since 1990, thereon rainforest valleys have been clear cut, 142 species of salmon have already become extinct, and the habitats of grizzly bears, wolves and many other creatures are threatened. Logging, however, provides jobs, profits, taxes for the government and cheap products of all kinds for consumers, so the government is reluctant to restrict or control it.
Much of Canada's forestry production goes towards making pulp and paper. According to the Canadian Pulp and Paper Association, Canada supplies 34% of the world's wood pulp and 49% of its newsprint paper. If these paper products could be produced in some other way, Canadian forests could be preserved. Recently, a possible alternative way of producing paper has been suggested by agriculturalists and environmentalists: a plant called hemp.
Hemp has been cultivated by many cultures for thousands of years, it produces fiber which can be made into paper, fuel, oils, textiles, food, and rope. For many centuries, it was essential to the economies of many countries because it was used to make the ropes and cables used on sailing ships; colonial expansion and the establishment of a worldwide trading network would not have been possible without hemp. Nowadays, ships' cables are usually made from wire or synthetic fibers, but scientists are now suggesting that the cultivation of hemp should be revived for the production of paper and pulp. According to its proponents, four times as much paper can be produced from land using hemp rather than trees, and many environmentalists believe that the large-scale cultivation of hemp could reduce the pressure on Canada's forests.
However, there is a problem: hemp is illegal in many countries of the world. This plant, so useful for fiber, rope, oil, fuel and textiles, is a species of cannabis, related to the plant from which marijuana is produced. In the late 1930s, a movement to ban the drug marijuana began to gather force, resulting in the eventual banning of the cultivation not only of the plant used to produce the drug, but also of the commercial fiber-producing hemp plant. Although both George Washington and Thomas Jefferson grew hemp in large quantities on their own land, any American growing the plant today would soon find himself in prison — despite the fact that marijuana cannot be produced from the hemp plant, since it contains almost no THC (the active ingredient in the drug).
In recent years, two major movements for legalisation have been gathering strength. One group of activists believe that all cannabis should be legal — both the hemp plant and the marijuana plant — and that the use of the drug marijuana should not be an offense. They argue that marijuana is not dangerous or addictive, and that it is used by large numbers of people who are not criminals but productive members of society. They also point out that marijuana is less toxic than alcohol or tobacco. The other legalisation movement is concerned only with the hemp plant used to produce fiber; this group wants to make it legal to cultivate the plant and sell the fiber for paper and pulp production. This second group has had a major triumph recently: in 1997, Canada legalised the farming of hemp for fiber. For the first time since 1938, hundreds of farmers are planting this crop, and soon we can expect to see pulp and paper produced from this new source.

单选题 Logging is not banned chiefly because

A. scientists are overestimating the damage.
B. people benefit economically from it.
C. some creatures are only threatened but not endangered.
D. it provides jobs to the consumers.

单选题 Canadian forests will not face destruction if

A. alternative sources for paper products are found.
B. logging is banned by the local government.
C. consumers increase their environmental sensitivity.
D. Canadian Pulp and Paper Association reduces its production.

单选题 The hemp plant was essential to worldwide trade in the past because

A. hemp was a very profitable export.
B. ships' ropes were made from it.
C. hemp was used as fuel for ships.
D. hemp was used as food for sailors.

单选题 Which of the following is a reason for the legalisation of the hemp plant?

A. Both the hemp and the marijuana plant are healthy for people.
B. Productive members of society depend on marijuana for production.
C. Long time usage of marijuana will not result in addiction.
D. The hemp plant is a useful source for the production of paper and pulp.

单选题 The author seems to imply in the passage that

A. the grounds on which hemp is banned cannot be justified.
B. drug addiction is an even more serious problem of the world.
C. American Presidents can be exempt from the punishment of law.
D. marijuana is an addictive drug that should be banned worldwide.