At our factory there are a few machines similar to described in this magazine.
A. them
B. these
C. those
D. ones
网友回答
A. them
B. these
(答案→)C. those
D. ones
解析：考查代词：句意：我们工厂的有些机器和杂志上描述的相似。这里需要代词指代the machines，those 是代词，特指前面的可数名词复数，them用作宾语，指前面所提到过的事或物，these这些，ones泛指，前面的可数名词复数，选C。