有两道题：
1. For many people, a big portion of chips is the junk food. Butaccording to one scientist, Professor Rimm, the size of most portions is fartoo big, ___ instead should only include six fries.
答案：and
2. A typical meal is rice with grilled fish and a leafy vegetable, ___is served with soup with pork, alongside milk and dried fruit.
答案：which
我感觉这两个题and和which都可以，恳请老师指点迷津。
互换答案是不能的。用 and， 表示本句的主语跟前文的主语是一致的；用 which关系代词，它的先行词是紧挨着它的前文的表语，而不是前文的主语。
1. For many people, a big portion of chips is the junk food. But according to one scientist, Professor Rimm, the size of most portions is far too big, ___ instead should only include six fries.
答案：and
——本句 should only include 的主语是 the size（分量），若填 which，指代哪个？
2. A typical meal is rice with grilled fish and a leafy vegetable, ___ is served with soup with pork, alongside milk and dried fruit.
答案：which
——本句是定语从句，is served with 的主语是which，而 which 指代很具体细腻的表语 rice with grilled fish and a leafy vegetable，而不是主语 meal。
