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通常采用在 that 從句前加上類似 the fact 等詞的方法,以次避免出現(xiàn) “ 介詞 +that從句 “ 的現(xiàn)象. 正確的句子應(yīng)該是: I don’t doubt that John will e on time. 分析: doubt 通常表示 “ 懷疑 ” 、 “ 不相信 ” 的意思,它的后面接賓語從句是,在否定句和疑問句中接由 that引導(dǎo)的賓語從句;在肯定句中一般接由 whether或 if引導(dǎo)的賓語從句. 正確的句子應(yīng)該是: I didn’t know he was here. 分析:如果主句用過去時,從句一般也要用過去時,前后時態(tài)一致,這是基本原則. : 正確答案是: B. 通過前面一句 “around 30, memory begins to decline, particularly your ability to perform mathematical putations.” 得出 increase應(yīng)該與 decline互為反義. 正確答案是: B. 由文章中 “National Institute of Health figures show that the attack of such “old age” diseases as arthritis, rheumatism, and heart illness begin around age 60 in men, at age 65 in women.” 這句中可以看出老年 疾病指的是關(guān)節(jié)炎、風濕病和心臟?。? 正確答案是: C. 由文章中 “At 60, your brain possesses almost four times as much information as it did at age 21.” 得出選項 A是正確的.由文章中 “aro und 30, memory begins to decline, particularly your ability to perform mathematical putations.” 得出選項 B和選項 D都是正確的. 正確答案是: A 通過對全文的跳讀尋找可 以找出所提到的科學(xué)家的名字. 正確答案是: A 通過對文章第二段落的理解可以得出正確答案. Ⅳ .改寫成分詞做狀語的句子. Walking in the park, she saw an old friend. Being blind, how could they see the elephant? Having been there many times, he offered to introduce the history of the country. Having rebuilt this way, these temples look even more beautiful. Being excited, she could hardly say a word.