Every second, 1 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, thirteen rainforest valleys have been clearcut, 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 t
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
In 1915 Einstein made a trip to G6ttingen to give some lectures at the invitation of the mathematical physicist David Hilbert. He was particularly eager too eager, it would turn (1) to explain all the intricacies of relativity to him. The visit was a triumph, and he said to a friend excitedly," I was able to (2) Hilbert of the general theory of relativity."
(3) all of Einstein’s personal turmoil (焦躁) at that time, a new scientific anxiety was about to (4) . He was struggling to find the right equations that would (5) his new concept of gravity,(6) that would define how objects move (7) space and how space is curved by objects. By the end of the summer, he (8) the mathematical approach he had been (9) for almost three years was flawed. And now there was a (10) pressure. Einstein discovered to his (11) that Hilbert had taken what he had learned from Einstein’s lectures and was racing to come up (12) the correct equations first.
It was an e
A. after
B. about
C. on
D. in
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