다음 빈칸에 들어갈 말로 가장 적절한 것을 고르시오.In sudden … | [법원직 9급 영어] 13년 1회차 기출문제 상세 페이지

다음 빈칸에 들어갈 말로 가장 적절한 것을 고르시오.
In sudden infant death syndrome (SIDS), a sleeping baby stops breathing and dies. In the United States, SIDS strikes about two of every thousand infants, usually when they are two to four months old. SIDS is less common in cultures where infants and parents sleep in the same bed, suggesting that        may be important. Indeed, about half of apparent SIDS cases maybe accidental suffocations caused when infants lie face down on soft surfaces. Other SIDS cases may stem from problems with brain systems regulating breathing or from exposure to cigarette smoke.

eating habits

sleeping position

domestic violence

the age of infants