(一)          Studies have shown that certain groups of people are __21.___ to mosquito bites. These include those who are pregnant, have a higher-than-normal body ___22.___ or have type of O blood. These groups should be aware they are more attractive to mosquitoes and stay inside __23.__ possible, especially at dawn and dusk. Many __24.___ of mosquitoes are more likely to bite at these times. People should wear light, bright colors __25.__ dark colors attract the insects.
【題組】21.
(A) prone
(B) instant
(C) joyous
(D) immense