departure n.啟程；離開
deposit vt.存入；寄存
desperate adj.絕望的；不顧一切的
devotion n.現(xiàn)身；熱心
dial vt.撥（電話號碼）
dilemma n.困境
dishonest adj.不誠實的
distant adj.遙遠的
doom vt. 注定；判決
dove n.鴿子
drawback n.缺點
dull adj.陰暗的；呆笨的
dusk n.黃昏；
ecology n.生態(tài)；生態(tài)學
economics n.經(jīng)濟學
enclosure n.圍地
encyclopedia n.百科全書
entirely全部地 adv.
equator n.赤道
ethics n.倫理學
evolution n.進化；發(fā)展
expedition n.探險（隊）
expense n.花費；費用
exploration n.探險；探測
extreme極度的；極端的
II. 重點短語
1. be in a desperate state 處境嚴重
2. be caught in a dilemma 處于進退兩難的境地
3.be distant from 離太陽很遠
4. be dull of hearing 聽覺不靈敏
5. form/send/take part in an expedition 組織/派遣/參加探險/遠征隊
6.at the expense 以….為代價
7.at sb’s expense 由某人付錢
8.at the extreme edge of 在…的極邊緣
III. 佳句賞析
1 .On our departure from Tahiti, some of the crew took over the ship.
2. He has deposited a lot of money recently.
3. It’s too dark，too dull，and basically uninteresting.
4. As dusk fell，we seem to face an uncertain future.
6. Broadly speaking ，I would agree with Shirley，though not entirely.
8.He finished the job at the expense of his health.
9. He had his book printed at his own expense.
10. We must explore all the possibilities.
11. It is so wet there that the trees are extremely tall.
IV. 詞匯練習
1.His failure made him （絕望）
2. I am in (完全)agreement with you.
3.I （存錢）ten dollars in my savings account.
V. 短語練習
1.Her son， to whom she was so ， went abroad ten years ago.
A. loved B.cared C. devoted D. affected
2. His business was very successful, but it was at the of his family life.
A.fare B.fee C. expense D.charge
IV. 詞匯練習
1. desperate 2. entire 3. deposited
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