12. Getting a flu shot before the start of flu season gives our body a chance to build up protection against the __________ that could make us sick.
(A) poison (B) misery (C) leak (D) virus
12. Getting a flu shot攻擊 before the start of flu season gives our body a chance 機會to build up protection保護against 抵抗 反對the(D) virus病毒 that could make us sick.