Whenkeepingducks,onehastoconsiderjusthowmanythelandwill...

问题详情：

When keeping ducks, one has to consider just how many the land will support. Generally the rule is 100 ducks per hectare. If more than this proportion is introduced, there is a risk of compacting the soil, which can lead to muddy conditions for long periods as the rain is not easily absorbed into the ground.

Ducks must be given greater quality of food, especially if regular eggs are desired. An adult duck will eat between 170 to 200 grams of food a day. If the ducks have access to grass and a pond, they will be able to find for themselves approximately 70% of their daily dietary, requirements in warmer months but less than half that in colder times. Therefore, it is important that they are fed enough food, such as grain, every day.

The eggs of ducks as food for humans have a mixed reputation. This is because of a number of cases of salmonella food poisoning in Europe in the 1970s. Although it was never finally shown that duck eggs were to blame, the egg-eating public stopped buying and many duck egg producers went bankrupt. Indeed, there is a risk of salmonella poisoning when ducks lay their eggs in damp conditions, such as on ground that is constantly wet. And commercial duck egg production in France and England, where the out-breaks of salmonella poisoning took place, followed the same standards as those used in hen egg industry, which experienced no salmonella problems.

The salmonella scare was over by the early 1980s, but, at least markets like Australia and New Zealand, few producers wished to risk investment in ducks for fear of problems. No large-scale commercial duck productions exist in these countries. It has thus been left to small producers, and, more commonly, home duck keepers.

28. In cold winter months, how much food does a keeper at least have to supply for 100 adult ducks per day.

A. 8.5kg          B. 10kg         C. 5.1kg                D. 17kg

29. Salmonella food poisoning ____________

A. resulted from consumption of duck eggs.

B. created difficulties for the duck eggs business.

C. occurred all over Europe.

D. was found in both duck and hen eggs.

30. Duck eggs _______

A been produced in large quantities in New Zealand since the early 1980s.

B. are more at risk of salmonella pollution than hen eggs.

C. may be polluted when laid in wet conditions.

D. should be kept at 5℃ to prevent pollution.

31. Which of the following statements is true according to the passage____________

A. It is better to have 120 ducks if you have one hectare of land. 

B. Duck eggs have higher standards to follow than any other egg industry.

C. People stop keeping ducks in Australia and New Zealand.

D. The salmonella scare lasted for about 10 years.

【回答】

ABCD

知识点：阅读理解

题型：阅读理解