【正文】
hout which 答案: D 5. He is my son, ________a better son does not exist. A. but B. than who C. against whom D. than whom 答案: D 6. He made another wonderful discovery, ________of importance to science. A. which I think is B. which I think it is C. which I think it D. I think is 答案: A 7. Mother bought me 3 books on English study, the second ________ I really liked. A. of that B. of which C. that D. which 答案: B 8. ________is known to us all is that the old scientist, for ________life was hard in the past, still works very hard in his eighties. A. As。 whose C. What。 whose 答案: C