[单项选择]It is quite common that people don't complain about the weather in that city.
A. 常见的是城市的人们不抱怨天气。
B. 那个城市的人们不抱怨天气，这是常见的。
C. 人们不大会弄清楚那个城市的天气情况。
D. 那个城市的人们不谈论天气，这时很普遍的。

A.α-螺旋

B.β-折叠

C.PolyA尾

D.m⁷GpppN^m

E.双螺旋结构

[听力原文]
M: Excuse me. Did you say that these shirts were fifteen dollars
W: No, I said fifty dollars. Here’ s the price on the tag.

[精解] 该题为数字题。女士否认衬衫是“fifteen dollars”，而强调是“fifty dollars”。