问题补充:
单选题Scientiststhinktheyhave_____intheirattempttofindthecausesofsomemajordieases.A.broken throughB.worked outC.fallen outD.got round
答案:
A解析本题译文:科学家认为他们在探索某些重要疾病的病因中已取得重大突破。break through(=be successful after overcoming a difficulty)突破;取得重大成果:Scientists hope to break through soon in their fight against heart disease.(科学家希望在与心脏病斗争中很快取得重大成果。)