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Do you like animals? Do you want to keep animals? Yes, many people like animals and want to keep a lovely animal as a （71） p_____. It's a pity that they don't have a suitable place to keep them. However, keeping fish may be the best choice.

Why keep them?

People keep dogs and cats because they enjoy their friendship. Fish can not be friendly, but they have beautiful shapes and colors. It's a pleasure to watch as they swim （72）i_____ their tank（水槽）.

What do they need?

First of all, the fish need a suitable （合适的） tank, and you must fill the tank （73） w_____ suitable water. It is also good for （74） t_____ to have a few water plants in the tank to keep the water pure （纯净）. Putting a few snails （蜗牛） in the tank is a good （75） i_____. They will keep it （76） c_____

What about feeding them?

There are many kinds of fish food （77） t_____ you can get in the shops. Most are suitable for all kinds of fish. You should feed your fish only （78） o_____ a day. It is important not to give them （79） t_____ much food. Just give them as much as they can （80） e_____ up in about 15 minutes. This will keep them healthy.

21岁未婚女子，18岁初潮，经量少，周期3～6月一次，LMP：8个月前。追问病史，不食肉，每日饭量2～3两及少量蔬菜。检查：形体消瘦， * * 发育不良，阴毛稀少，外阴未婚型，子宫稍小，双侧附件正常，此病人治疗首选：

A．雌激素周期治疗

B．补充多种维生素

C．用HCG诱发排卵

D．纠正全身健康状况

E．孕激素周期治疗