单项选择题

After reading this passage, we can see that （）

A．all birds live water
B．birds get very dirty
C．staying clean is very important to birds
D．preening takes a lot of time

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单项选择题

Keiko weighs about（）

A．30,000 pounds
B．18,000,000 grams
C．60,000 ounces
D．180,000 kilograms

单项选择题

Keiko has（）

A．enjoyed being with other sea animals
B．killed other sea animals that have come into his pen
C．hasn't seen any other animals
D．had limited contact with other sea animals