阅读理解。 Do you keep pet fish at home? It is fun to keep pet fish. I have got a tank , the tank has two fish in it. one is a goldfish, and the other is an angel fish. the angel fish has black stripes. it looks prettier than the goldfish. I feel happy when I look at them. I usually look at them when I have something unhappy or feel tired. I always keep the water in the tank clean, because both the goldfish and the angel fish like clean water. They can't live in dirty water. In winter, I need a heater in order to keep water warm. The angel fish doesn't like cold water. I only feed the fish once a day. Too much food may make the fish die. 1. It is _______ to keep pet fish. [     ] A. very interesting B. easy C. expensive D. important 2. I have got _______ pet fish. [     ] A. one B. some C. two D. many 3. The angel fish _______ stripes. [     ] A. has black B. has white C. doesn't have D. has yellow 4. When you keep pet fish, you must _______. [     ] A. give the fish much food B. keep the water warm all year C. feed them three times a day D. keep the water in your tank clean 5. What's the meaning of the word 'tank' in the first paragraph? [     ] A. 坦克 B. 蓄水池 C. 柜子 D. 鱼缸