Directions: In this part, there is a passage with ten blanks. For each blank there are four choices marked A, B, C and D . Choose the best answer for each blank and mark your answer on the ANSWER SHEET.

　　Color is very important to most animals for it helps them to get along in the world. Color 1 to make an animal difficult for its enemies to 2 . Many animals match their surroundings so well that as long as they do not move no one is 3 to see them . You probably have often " jumped”a rabbit . If you 4 ，you know how the rabbit sits perfectly still until you are just a few feet away . You 5 see the rabbit till it runs for its 6 matches very closely the place where it is sitting . Many times you may have walked past a rabbit 7 didn’t run and you never knew it was there at all . One of the most usual color schemes that helps animals to keep from being seen , is a dark back and light underpants , if an animal is the same color all 8 , there is always a dark shadow along the animal ' s belly (腹部). 9 an enemy couldn’t ' t see the animal he could see this dark shadow . The shadow makes the animal stand out to view. But if the belly is 10 than the rest of the animal, the shadow will not be noticed.

　　1. A. helps B. contributes C. tries D. manages

　　2. A. watch B. see C. catch D. kill

　　3. A. enable B. hardly C. likely D. possible

　　4. A. do not B. had not C. did D. have

　　5. A. sometimes B. occasionally C. seldom D. often

　　6. A. surface B. coat C. shape D. appearance

　　7. A. you B. that C.it D. which

　　8. A. alone B. together C. over D. right

　　9. A. Even if B. Unless C. However D. As long as

　　10. A. thinner B. darker C. bigger D. lighter

　　答案解析：

　　1.【答案】 A

　　【解析】A 項helps 意為“幫忙，幫助”，符合題意。 contributes 意為“貢獻” ; tries 意為“試圖”; manages 意為“設法”。

　　2.【答案】B

　　【解析】本句可譯為“有了顏色的幫助，動物的天敵就很難看到它。”watch 是“觀看，注視，' ; see 是“看見，了解”;catch 是“抓住，' ; kill 是“殺死”。B 項符合題意。

　　3.【答案】C

　　【 解析】 本句可譯為：“只要他們不動，沒人能看到他們。”謂語不完整，缺少表語部分，A 項可排除;B 項hardly 無法使意思成立;possible 常用形式為It ' s possible … 。

　　4.【答案】D

　　【解析】此處為省略句，根據(jù)前一句You probably have often " jumped”a rabbit ，完整的句子應為：If you have often jumped a rabbit 二。A 、B 、c 三項均無法使句子正確。

　　5.【答案】C

　　【 解析】 seldom 意為“很少，不常”，有否定含義，符合題意。occasionally 意為“偶爾”, A 、B 、D 三項是三個頻度副詞，均無否定含義。

　　6.【答案】 B

　　【解析】coat 意為“覆蓋物(動物的毛)" ，使句子意思完整，符合題意。A 項surface 意為“表面” ; C 項shape 意為“形狀” ; D 項appearance 意為“面貌”均不符合題意。