HOW MANY PERCENTS OF ALL REPORTED UFO SIGHTINGS ARE NOT IDENTIFIED

43. - BO DE TRAC NGHIEM TIENG ANH 9 3 DE
Lớp 9 BO DE TRAC NGHIEM TIENG ANH 9 3 DE

43. How many percents of all reported UFO sightings are not identified?

A. 10%-20% B. 20%-30% C. 30%-50%

D. 80%-90%