单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Which of the following is NOT true according to the passage

A.A typhoon is a kind of storm.
B.Typhoons mostly happen in summer.
C.The strongest typhoons occur around the Pacific Ocean.
D.The strongest typhoons occur in December.