更多"More and more of the world’s supply"的相关试题:
[单项选择]More and more of the world’s supply of seafood is coming from farms.
Although 80% of the world’s seafood comes from marine harvests, there is a major shift under way toward aquaculture now.
Nearly 40% of salmon marketed today are raised in captivity, compared with 6% a decade ago. Forty percent of all clams, oysters, and mussels are produced in farm environments, along with 65% of freshwater fish. Between 1990 and 1996, fish-farming production rose from 12.4 million to 23 million tons worldwide, writes Anne Platt McGinn in an article for World Watch magazine.
"The fact that world seafood supplies continue to increase at all is due almost entirely to the phenomenal growth in aquaculture," says McGinn, a research associate at the World Watch Institute. Commercial aquaculture is driven by rising human population at a time when over harvested wild fish stocks are in decline and conven- tional farm production has leveled off.
Biotechnology is contributing to high-yield a
A. the human population is increasing fast.
B. the wild fish stocks are decreasing due to over fishing.
C. the cost of developing aquaculture is comparatively low.
D. there is no improvement in conventional farm production.
[单项选择]
More and more of the world’s supply of seafood is coming from farms.
Although 80% of the world’s seafood comes from marine harvests, there is a major shift under way toward aquaculture now.
Nearly 40% of salmon marketed today are raised in captivity, compared with 6% a decade ago. Forty percent of all clams, oysters, and mussels are produced in farm environments, along with 65% of freshwater fish. Between 1990 and 1996, fish-farming production rose from 12.4 million to 23 million tons worldwide, writes Anne Platt McGinn in an article for World Watch magazine.
"The fact that world seafood supplies continue to increase at all is due almost entirely to the phenomenal growth in aquaculture," says McGinn, a research associate at the World Watch Institute. Commercial aquaculture is driven by rising human population at a time when over harvested wild fish stocks are in decline and conventional farm production has leveled off.
Biotech
A. the human population is increasing fast.
B. the wild fish stocks are decreasing due to over fishing.
C. the cost of developing aquaculture is comparatively low.
D. there is no improvement in conventional farm production.
[单项选择]E
Around the world more and more people are taking part in dangerous sports and activities. Of course, there have always been people who have looked for adventures ——those who have climbed the highest mountains, traveled into unknown parts of the world or sailed in small boats across the greatest oceans. Now, however, there are people who look for an immediate excitement from a risky activity which may only last a few minutes or even seconds.
I would consider bungee jumping to be a good example of such an activity. You jump from a high place (perhaps a bridge or a hotair balloon) 200 metres above the ground with an elastic (有弹性的) rope tied to your ankles. You fall at up to 150 kilometres an hour until the rope stops you from hitting the ground. It is said that about 2 million people around the world have now tried bungee jumping. Other activities which most people would say are as risky as bungee jumping include jumping from tall building and diving into the sea from the t
A. Dangerous sports: what and why
B. The boredom of modern life
C. Bungee jumping: Is it really dangerous
D. The need for excitement