26. Tuition at an American university runs _______ forty thousand dollars a semester. (A) so high as (B) so higher than (C) as high as (D) as high to

31. Why did the researchers say eggs came after the chicken? (A) Because one of the egg-forming ingredients comes only from the chicken. (B) Because eggshell could be used to make a lot of products. (C) Because eggs are much lighter than the chicken. (D) Because they are British researchers.