4.　　David comes from a small town in Tainan. Last week, his house in Tainan fell down in a terrible earthquake. Because David’s little sister got hurt when the house fell down, his parents had to stay in the hospital in Tainan to take care of her.
 　　David felt sad whenever he watched the TV news about the big earthquake in Tainan. Many people died or got hurt. David also lost his pet dog, Kiko. Luckily, all of his classmates and friends were all safe. They talked and comforted each other on the Internet. David hoped to see them soon.
【題組】59.Why did David’s parents stay in the hospital?
(A)Because they both got hurt.
(B)Because they had to take care of his little sister.
(C)Because they were a doctor and a nurse.
(D)Because they wanted to help their neighbors（鄰居）.