A—atmosphere B—storm
C—frost D—hail
E—thunder F—haze
G—lightning H—hurricane
I—whirlwind J—fog
K—dew L—humidity
M—freeze N—snowfall
O—drought P——typhoon ______霜 ______大气

A．By registering online.
B．By writing to the organizer.
C．By sending a fax to the organizer.
D．He went to attend the exhibition directly.