Do you know how to keep fish at home?

The fish need room. They must not be crowded（拥挤）. Fish need oxygen(氧气). Fish get it from water in the tank. There must be enough water for all fish in the tank. So the size of the tank is important..

In the tank many people put small plants(植物). They give oxygen to the water. Plants help in other ways, too. Fish can nibble(轻咬)on the plants. They hide in the plants and sleep, lay eggs there.

Both the plants and fish need light. You can put near a window. It will get light there. But remember: a window may let cold air in. The cold can kill(杀死) your fish. Too hot water can kill your fish, too.

The fish need food and you should feed them every day. Giving them too much food is bad. It will make the water dirty. However, the fish should get just enough food. They should finish the food in 10 minutes. No extra(多余) is left. When this happens, the amount(数量)of food is right.

(   )16. A tank near the window may NOT be good for pet fish because________.

A. no air can get in through the window   B. pet fish will jump out of the window

C. plants in the tank will grow too big     D. cold air may make the water too cold

(   )17.________is very important to pet fish.

A.  Water    B.  Sunlight   C. The size of the tank      D. All the above

(   )18. Which of the following may cause（导致） pet fish to die?

A. Too little room for fish.             B. The plants in the tank.

C. The light through the window.        D. A lot of water in the tank.

(   )19. The word "this" in the last paragraph refers to(指的是)________.

A. giving pet fish too much food            B. giving pet fish too little food

C. giving pet fish the right amount of food    D. giving pet fish enough water

(   )20. This passage mainly talks about______________.

A.why fish must be put in a glass tank   

B. how people should keep their pet fish

C. what kind of plants is good for pet fish

D. how much food should we give to pet fish

Penguins are lovely animals. Most people like them. But now as many as 10 of the 17 kinds of penguins are in danger of disappearing. The number of penguins has decreased by ( 减少了) 30% since 1987.
Penguins are black and white birds that live in the southern part of the world. They are common in the Antarctic Continent (南极大陆) ,New Zealand, Australia and South America. Many live near cold waters (水域). But some live near warm waters in Galapagos Islands. Penguins  cannot fly, but  they are fine swimmers. The shape of their body helps them to survive. Penguins eat fish and krill  (磷虾). They have short wings that help them to dive up to 900 feet to catch larger fish. They can swim 10-15 kilometers an hour which lets them protect themselves. They also have lots of body oil that helps in keeping them dry in the water.
The warming of the earth is the reason for the decrease in the number of penguins. The hotter and hotter air has caused ocean waters to become warmer. Higher water temperature has decreased the fish and krill. Some years later these birds are completely unable to reproduce. And many adult penguins die of hunger.
Too much fishing, exploration for oil and oil leaks (泄漏) also make penguins be in danger. Poisonous things in ocean waters are another danger. Penguins also have their enemies, including sharks, seals and sea lions.
【小题1】Penguins can do the following except________.

-- The fish            nice. Your mother is a great cook.
-- Really? Try some, and you will like it more.

阅读短文，根据短文内容及首字母提示，在空白处填入一个适当的单词。

Do you like animals? Do you want to keep animals? Yes, many people like animals and want to keep a lovely animal as a 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 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 w_____  suitable water. It is also good for 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 i_____  . They will keep it c_____  

What about feeding them?

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