单选题 "Crying for a Smoke" suggests there is a cause-and-effect relation between

A、 the mother's smoking and her baby's stomachache
B、 the mother's annoyance and her baby's cries
C、 research results and the babies' parents
D、 dad's smoking and mom's smoking

【正确答案】 A

【答案解析】[精析] 细节题。题干意为“‘因为烟而哭闹’中说什么之间有因果关系”。从文章的第二段第二句话Researchers at a..., either before or after their babies were born．可知，母亲吸烟极有可能会导致孩子肚子疼。所以正确的答案为A。