80. Advertisement: LACE>ClarkLACE> brand-name parts are made for cars manufactured in this country. They satisfy all of our government automotive tests-the toughest such tests in the world. With foreign-made parts, you never know which might be reliable and which are cheap look-alikes that are poorly constructed and liable to cost you hundreds of dollars in repairs. Therefore, be smart and insist on brand-name parts by LACE>ClarkLACE> for your car.

The argument requires the assumption that

A. LACE>ClarkLACE> parts are available only in this country

B. foreign-made arts are not suitable for cars manufactured in this country

C. no foreign-made parts satisfy our government standards

D. parts that satisfy or government standards are not as poorly constructed as cheap foreign made parts

E. if parts are made for cars manufactured in our country, they are not poorly constructed

我觉得C和D 都对,排除不了C,请大家给我好的排除方法和理解方法.

将C取非：有外国PARTS满足我国标准。原文结论（brand-name parts by Clark 是可靠的，应买它）一样成立。故不是ASSUMPTION。

将D取非：满足我国标准，一样是烂货。原文结论不能成立。故为ASSUMPTION

They satisfy all of our government automotive tests只是clark的优势之一，不必然推导出外国的东东不通过此类测试。

关键的是:With foreign-made parts, you never know which might be reliable and which are cheap look-alikes ..这是笔者建议顾客要购买clark的原因。所以，如果clark跟外国的东东一样cheap，笔者的结论就不成立。因此D是正确答案