问题
单项选择题
血液中HCO3-/HCO3缓冲系统的正常比值为（ ）
A．5/1
B．10/1
C．15/1
D．20/1
E．25/1
答案
参考答案：D
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血液中HCO3-/HCO3缓冲系统的正常比值为（ ）
A．5/1
B．10/1
C．15/1
D．20/1
E．25/1
参考答案：D
| 完形填空。 | |||
| There're different kinds of animals in the zoo. We see the zoo keepers give them 1 to eat. They don't have to 2 food by themselves. They just eat, walk and 3 all day. So many of 4 may think that the animals there 5 happy and lucky. But most 6 them are sad. Why? They're 7 free. Animals like elephants, monkeys and tigers 8 live freely and happily in 9 or mountains. Tigers, 10 example, run, jump, play with their children 11 catch small animals for food. But now they have to stay in 12 rooms in the zoo. Their life in the zoo is 13 different from their life in the forests. Now many of us think 14 animals should go back to forests and mountains so that 15 earth will become better. | |||
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