段2：①In just one generation, millions of mothers have gone to work, transforming basic family economics. ②Scholars, policymakers, and critics of all stripes have debated the social implications of these changes, but few have looked at the side effect: family risk has risen as well. ③Today’s families have budgeted to the limits of their new two-paycheck status. ④As a result, they have lost the parachute they once had in times of financial setback—a back-up earner (usually Mom) who could go into the workforce if the primary earner got laid off or fell sick. ⑤This “added-worker effect” could support the safety net offered by unemployment insurance or disability insurance to help families weather bad times. ⑥But today, a disruption to family fortunes can no longer be made up with extra income from an otherwise-stay-at-home partner.
31.Today’s double-income families are at greater financial risk in that
[A]the safety net they used to enjoy has disappeared.
[B]their chances of being laid off have greatly increased.
[C]they are more vulnerable to changes in family economics.
[D]they are deprived of unemployment or disability insurance.
答案：C
问：31题题干中的Today’s double-income families对应原文中的什么信息？（多选题）
A : basic family economics
B : Today’s families
C : two-paycheck
D : a back-up earner
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