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 Glo

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 commpanion 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.