By saying 'a variant on the formula' (Line 1, Paragraph 4), the author means that A.luxury-car rental is a new business. B.foreign car-rental business is different from luxury-car clubs. C.rental-car companies run in different ways. D.rental-car business is newly developing.
A.luxury-car B. B.foreign C. C.rental-car D. D.rental-car
【参考答案】
B 解析：语义理解题。根据题干定位至第四段，与之前两段提到的luxury-car club不同的是，此处提到了一......