Tham khảo tài liệu 'anh văn toefl structure-006', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Anh văn TOEFL Structure-006 1 . When in arctic regions the Aleuts construct igloos as temporary winter shelters. u a travel u b to travel u c traveling them u d traveling 2 Most substances contract when they freeze so that the density of a substance s solid is ---of its liquid. u a than the higher density u b higher than the density u c the density is higher than that u d the higher the density 3 The mechanism by which brain cells store memories is ---clearly understood. u a none u b no u c not u d nor 4 Desert animals a means of retaining moisture in such a hot dry climate if they are to survive. u a need u b .
