问题
单项选择题
鸟氨酸循环合成尿素过程中一个氨由氨基甲酸磷酸提供，另一个氨来源于（ ）。
A．游离氨
B．谷氨酰胺
C．氨基甲酸磷酸
D．天冬酰胺
E．天冬氨酸
答案
参考答案：E
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鸟氨酸循环合成尿素过程中一个氨由氨基甲酸磷酸提供，另一个氨来源于（ ）。
A．游离氨
B．谷氨酰胺
C．氨基甲酸磷酸
D．天冬酰胺
E．天冬氨酸
参考答案：E
People live in different houses. You may know a wooden house or a paper house. But do you know a(n) 1 house? In 2008, the first ice house in North America opens its 2 to welcome some visitors. The floors, windows and walls are all made of ice. It has ten bedrooms 3 twenty people can stay there each night. Visitors to the house 4 in ice beds, sit on ice chairs and eat from ice plates. Well, the toilets are not made of ice, of course. It’s usually below zero so it is very 5 inside the house. However, do the visitors just sit there to 6 warm? No, visitors have to 7 special clothes. These can make 8 feel warm until morning. Workers 9 about four weeks designing the ice house. Visitors can only stay in this ice house in winter. It isn’t 10 in hot summer. Because this house is so special, it is becoming popular with young people.
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