我也在想这道题 看了一个美国人的解释 还是和fast有关
The key here is that we cannot use fast (or slow, for that matter) for
rate--we don't say a fast or slow rate, do we? Isn't it more natural to
say a high or low rate?
I call these "measurement" words, and they come up from time to time in
ETS grammar. For example, we don't say a hot temperature, we say a high
temperature, right? The correct answer provided is C. |