问题补充：
It is believed that the temperature is at around 2:00 pm in on day.
A. in its highest
B. at its tallest
C. at its highest
D. in its tallest
答案：
A. in its highest
B. at its tallest
(答案→)C. at its highest
D. in its tallest
解析：at its highest意为“达到最高点”。
