26. A   Most forms of steel abruptly become brittle

27. J   ... that resists fractures at much lower temperatures

28. B   without the need for expensive additives

29. E     providing a lifeline for the besieged British

30. I   the ships cracked in the icy north Atlantic

31. N   So scientists have strived to find a solution

32. C   a more physical approach

33. G   that is comparable to that of..

34. H   the number of components needed in a construction. Job

35. K     by replacing solid supports with hollow tubes