单项选择题

Eleven days after her son Benjamin’s birth by C-section, Linda Coale awoke in the middle of the night in pain, one leg badly swollen. Just (67) her doctor returned her phone call asking what to do,she dropped dead (68) a blood clot (凝块).
Pregnancy-related deaths like Coale’s (69) to have risen nationwide over the past decade, nearly tripling in the state with the most careful count-California. And (70) they’re very rare--about 550 a year out of 4 million births (71) --they’re nowhere near as rare as they should be. Pregnancy-related death rate is four times (72) than a goal the federal government (73) for this year. "It’s unacceptable," says Dr. Mark Chassin of The Joint Commission, the agency which recently issued a(n) (74) to hospitals to take steps to (75) mothers-to-be. "Maybe as many as half of these are (76) ."
Two years after Coale’s death near Annapolis,Maryland, her sister says (77) that list should be warning women about (78) of an emergency, like the clot called deep vein thrombosis (DVT) that can kill (79) it breaks out of the leg and moves to the lung. " (80) she wanted to do was have her own family, and when she (81) gets that privilege, she’s no longer (82) us," says Clare Johnson, who says her the sister’s (83) risk was being pregnant at age 35.
Pregnancy-related death (84) little public attention in U.S., (85) last year’s worry over the flu that killed at least 28 pregnant women. Among the (86) preventable causes are massive bleeding, DVT-caused lung disease and uncontrolled blood pressure.