18.詞匯搭配題.分析本句話__18__ common in-flight problem is deep venous thrombosis.注意到句中的problem和is,考察四個(gè)選項(xiàng),首先可以排除any,由于前面沒有one,所以可以排除other和 another.所以正確答案為one.

　　19.語境題.前面句子講在飛行中的一個(gè)常見問題是所謂的經(jīng)濟(jì)艙綜合癥,再分析本句話__19__ happens, don’t panic....發(fā)生,都不要恐慌.句中的__19__ happens為讓步狀語.由于此處為特指經(jīng)濟(jì)艙綜合癥所以可以排除whatever,所以可以確定正確答案為whenever.

　　20.語境題.分析本句話flights with at __20__ one attendant are starting to install emergency medical kits to treat heart attacks.注意到句中的one attendant,由此可以確定應(yīng)該選擇at least,表示至少.

　　1.didn’t do anything

　　2.play indispensable roles

　　3.Even so

　　4.are being developed

　　5.remembering all my life