单项选择题According to the author, the passage mainly deals with_____.
单项选择题Conventional computer models of the atmosphere fails to predict such a short-lived tornado because_____.
单项选择题The word exceeded in paragraph 1 most probably means_____.
单项选择题According to the passage, _____is the key factor to making Nowcasts a reality.
单项选择题According to the passage, the word Nowcast (paragraph 3) means_____.