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    21.Many scientists are looking for ways to ______ people's lives.

    A. protest

    B. protract

    C. prolong

    D. profound

    正確答案：C

    答案解析：譯文：許多科學(xué)家在尋找延長生命的方法。選項AB都有延長的意思，prolong指的是時間，生命等等的延長，而protract只指時間上的拖延，所以答案為C.

    22.The ______ in Janet's character has hindered her from advancement in her career.��

    A. weakness

    B. merit��

    C. defect

    D. shortcoming

    正確答案：C

    答案解析：譯文：詹妮特的性格缺陷阻礙了她事業(yè)進(jìn)步。weakness意為"弱點；嗜好"；merit意為"優(yōu)點，長處"；defect意為"缺 點，缺陷"；shortcoming意為"缺點，短處".

    23.He firmly ______ out that he had met with Rosaline.

    A. ruled

    B. kept

    C. declaimed

    D. declined

    正確答案：A

    答案解析：譯文：他堅決否認(rèn)曾與羅莎琳接觸過。rule out"否認(rèn)，不承認(rèn)".

    24.His answer was so confused that I could hardly make any ______ of it at all.��

    A. explanation

    B. meaning

    C. sense

    D. interpretation

    正確答案：C

    答案解析：譯文：他的答案很不清楚，我根本弄不懂。sense意為"意義；含義"，短語make sense of意為"弄懂…的意思"；explanation意為"解釋，說明，闡述"，側(cè)重說明事件的真相、原因；meaning意為"意義，意思；含義"，但不能在make sense of 短語中代替sense；interpretation意為"解釋，說明，闡明"，比較正式。

    25.By cutting down trees we ______ the natural home of birds and animals.��

    A. harm

    B. hurt

    C. injure

    D. damage

    正確答案：D

    答案解析：譯文：我們砍伐樹木的行為損壞了鳥獸的自然家園。damage意為"加害于…，損傷…"；harm意為"對…有害"；hurt意為"疼痛，受傷，（精神上）傷害"；injure意為"使受傷"，身體受外力傷害。

    26.We went on a（n） ______ to the mountain yesterday.��

    A. excursion

    B. trip

    C. tour

    D. travel

    正確答案：A

    答案解析：譯文：昨天我們到那座山里進(jìn)行了一次遠(yuǎn)足觀光。excursion意為"遠(yuǎn)足，短途旅行"；trip意為"旅游出行；行程"；tour意為"游歷；觀光"；travel意為"（長途）旅行".

    27.When Sarah and I ______ on an article for the school newspaper， we found it difficult to work together.��

    A. compiled

    B. gathered ��

    C. collaborated

    D. collected

    正確答案：C

    答案解析：譯文：當(dāng)我和薩拉為校報合作一篇文章時，我們發(fā)現(xiàn)很難在一起工作。collaborate意為"合作，合著"；compile意為"匯集；編輯"；gather意為"聚會，集會"；collect意為"收集；集合".

    28.Postal ______ are determined by the class and weight of the parcel mailed.��

    A. taxes

    B. payment

    C. fees

    D. premium

    正確答案：C

    答案解析：譯文：郵資是根據(jù)所郵包裹的等級和重量來定的。fee意為"費（如會費，入場費，手續(xù)費等）"；tax意為"稅，稅款"；payment意為"支付，付款"；premium意為"津貼；酬金".

    29.My father is so deaf that he has to use a hearing ______.

    A. help

    B. aid

    C. support

    D. tool

    正確答案：B

    答案解析：我父親耳聾得厲害，不得不使用助聽器。aid意為"輔助器具"；help意為"幫助"；support意為"支持"；tool意為"工具".

    30.The ______ of beer and alcohol in New Zealand is very high.��

    A. consumption

    B. use

    C. drink

    D. absorption

    正確答案：A

    答案解析：譯文：在新西蘭，啤酒和白酒的消費量很大。consumption意為"消費量"；use意為"使用，用途"；drink意為"飲料"；absorption意為"吸收".