问题
单项选择题 A1/A2型题
PCR反应中，引物1又称Watson引物，与引物1互补的寡核苷酸链是（）。
A.正义链
B.反义链
C.负链
D.双义链
E.编码区段互补链
答案
参考答案：A
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PCR反应中，引物1又称Watson引物，与引物1互补的寡核苷酸链是（）。
A.正义链
B.反义链
C.负链
D.双义链
E.编码区段互补链
参考答案：A
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| 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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