2019年6月四六级真题答案※ 真题答案下载

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　　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

　　30.1 the ships cracked in the icy north Atlantic

　　31. M 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 hollou; tubes

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