根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。How to Make a Glodfish Live for Decades Believe

根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
How to Make a Glodfish Live for Decades
Believe it or not , a goldfish could live for 10—25 years ot longer if it’s given proper care .However , with normal care it usually lives for about 6 years . The Guinness Book of World Records mentions a goldfish named Tish that lived 43 years!     【小题1】    .
Purchase the largest possible tank you can . While using a 20 liter tank is better for the fish than any kind of a fish bowl , at least 40 liters is necessary for quality of life a single fish . Chinese a tank with large surface area to increase the amount of oxygen in contact with the surface of the water.
    【小题2】     Be sure that any decorations you choose aren’t hollow (harmful bacteria can grow inside ) and that they don’t have sharp edges . Provide your fish with different areas in the tank , such as an open area ideal for swimming and a hiding area . If you feed them at the same time every day , they will soon be waiting for you at that time and grow used to your presence .
Add some equipment to increase oxygen into the water .     【小题3】     You can also have the current from a “waterfall” type filter help agitate (搅动) the water ‘s surface .
Clean the tank at least once every two weeks , but more frequently is preferable due to the large amount of waste .     【小题4】     
Feed the goldfish one to three times daily with food apecifically designed for goldfish .     【小题5】    Give them only as much as they can eat in a few minutes , and clean any leftovers immediately.
A.Provide mental and physical stimulation (刺激) for the fish .
B.Be aware that goldfish will not eat below 50--55  °C (10--14°C).
C.Here’s how to help your mpanion survive into the “ golden years ”.
D.If you do need to catch your fish ,consider using a plastic container rather than a net .
E.A small air pump can be necessary .
F.How often you do this will depend on the size of you tank , the number of fish .
G.If you choose to feed them more often , then reduce the size of the meals so you don’t overfeed. Ｃ