A、Buying machines. B、Removing manually. C、Applying poisons. D、Using animals. D

A burial place in Washington D.C. is using goats instead of poisons to remove weeds. Congressional Cemetery is near Capitol Hill. There are more than 65 000 graves there. In recent years, many weeds have grown in the cemetery. Officials did not want to use poisons, to kill the weeds. The cemetery is near the Anacostia River. Officials have worked for many years to remove pollutants from the river, which runs through the city. So cemetery officials decided to use goats. The animals are less costly than chemicals and do not hurt the environment. And the goats eat a lot of weeds. The animals are owned by Mary Bowen, a farmer. She operates a company called Browsing Green Goats. The cemetery pays her company more than $11 000 to have the goats remove unwanted plants from each hectare of the cemetery. But Mary Bowen says that is about half the cost of using herbicides. She hopes the goats will help more people understand that they can keep their property free of weeds without hurting the environment.
5. What new measure is taken to kill the weeds in Congressional Cemetery?
6. Why is the new measure taken?
7. What does Mary Bowen do?