注釋：
1. UC Davis ：加州大學(xué)戴維斯分校。UC是University of California (加利福尼亞大學(xué))的縮寫，該校有多個(gè)分校，UC Davis是其中一個(gè)。Davis以前是UC Berkeley分校的農(nóng)學(xué)院，后來獨(dú)立出來。Davis是一個(gè)大學(xué)城，很小的城市，Davis校園基本就構(gòu)成了這個(gè)城市。
2. quadrupedal and bipedal：quad-：構(gòu)詞詞素，是"四"的意思；bi-:構(gòu)詞詞素，是"二"的意思；ped-：構(gòu)詞詞素，是"腳"的意思；-al是構(gòu)成形容詞的后綴，表示"．．．的"。因此，quadrupedal意為"四足動(dòng)物的"，bipedal意為"二足動(dòng)物的"。
3. bipedalism：系bipedal（二足動(dòng)物的）的對(duì)應(yīng)名詞，這里后綴-ism表示"特征"、"特性"。
練習(xí)：
1. What did Michael Sockol and his team find out in their study of chimpanzees?
A) The evidence why chimpanzees can be trained to use treadmills.
B) The evidence why our apelike ancestors came to walk on four legs.
C )The evidence why our apelike ancestors came to walk on two legs.
D) The evidence why chimpanzees can be trained to walk on two legs.
2. Which of the following best interprets the meaning of"While the chimps worked out, …."(the first sentence of the third paragraph)?
A) While the chimps worked in the lab….
B) While the chimps exercised in the gym….
C) While the chimps tried to figure out what they should do….-
D) While the chimps tried to understand the instructions….
3. What was the result of the finding, according to Paragraph 5?
A) Three chimps used more energy walking on two legs.
B) One chimp used less energy walking on two legs.
C) One chimp used about the same energy walking on two legs as on four.
D) All of the above.
4. What was true of the hypothesis of the research?
A) Our apelike ancestors were anatomically different but had the same gaits.
B) Bipeds with natural selection had an advantage over quadruped.
C) Our apelike ancestors could adapt to different climate changes due to genetic variation.
D) Bipeds had an advantage over quadrupeds due to changes in the environment.
5. What does fossil and molecular evidence tell us about our earliest ancestors.
A) They experienced more climate changes than we do today.
B) Due to changes in climate, they were forced to travel between food patches.
C) They could cover more ground than their quadrupedal peers because they used less
energy.
D)They could travel longer distances on the ground than those who could use less energy.
答案與題解：
1. C 短文的第一段直接回答了這個(gè)問題。
2. B worked out在此是"運(yùn)動(dòng)，鍛煉"的意思，所以選擇 B。
3. D 第五段的第三、第四和第五句提供了答案。bipedalism was more expensive的意思是：兩足行走消耗更多的體能。walking upright的意思是：直立行走，即兩足行走。
4. B 第六段告訴了我們研究的兩個(gè)假設(shè)：猿人祖先在解剖學(xué)意義上存在著差異，這一
差異影響了它們的步態(tài)；這些差異在自然選擇的過程中決定了遺傳變異，而環(huán)境變化使得兩足行走的猿人比起四足行走的猿人更有優(yōu)勢(shì)。A、C、D都不是正確的說法，只有B在該段中被提到。
5. C 倒數(shù)第二段提供了問題的答案。travel longer distances用的是比較級(jí)，這里是將兩足行走的猿人與上文中四足行走的猿人做比較。those who could cover more ground using less energy指的是上文提到的與四足行走的猿人相比，體能消耗較小的兩足行走猿人。其他選擇都不是正確說法。
1. UC Davis ：加州大學(xué)戴維斯分校。UC是University of California (加利福尼亞大學(xué))的縮寫，該校有多個(gè)分校，UC Davis是其中一個(gè)。Davis以前是UC Berkeley分校的農(nóng)學(xué)院，后來獨(dú)立出來。Davis是一個(gè)大學(xué)城，很小的城市，Davis校園基本就構(gòu)成了這個(gè)城市。
2. quadrupedal and bipedal：quad-：構(gòu)詞詞素，是"四"的意思；bi-:構(gòu)詞詞素，是"二"的意思；ped-：構(gòu)詞詞素，是"腳"的意思；-al是構(gòu)成形容詞的后綴，表示"．．．的"。因此，quadrupedal意為"四足動(dòng)物的"，bipedal意為"二足動(dòng)物的"。
3. bipedalism：系bipedal（二足動(dòng)物的）的對(duì)應(yīng)名詞，這里后綴-ism表示"特征"、"特性"。
練習(xí)：
1. What did Michael Sockol and his team find out in their study of chimpanzees?
A) The evidence why chimpanzees can be trained to use treadmills.
B) The evidence why our apelike ancestors came to walk on four legs.
C )The evidence why our apelike ancestors came to walk on two legs.
D) The evidence why chimpanzees can be trained to walk on two legs.
2. Which of the following best interprets the meaning of"While the chimps worked out, …."(the first sentence of the third paragraph)?
A) While the chimps worked in the lab….
B) While the chimps exercised in the gym….
C) While the chimps tried to figure out what they should do….-
D) While the chimps tried to understand the instructions….
3. What was the result of the finding, according to Paragraph 5?
A) Three chimps used more energy walking on two legs.
B) One chimp used less energy walking on two legs.
C) One chimp used about the same energy walking on two legs as on four.
D) All of the above.
4. What was true of the hypothesis of the research?
A) Our apelike ancestors were anatomically different but had the same gaits.
B) Bipeds with natural selection had an advantage over quadruped.
C) Our apelike ancestors could adapt to different climate changes due to genetic variation.
D) Bipeds had an advantage over quadrupeds due to changes in the environment.
5. What does fossil and molecular evidence tell us about our earliest ancestors.
A) They experienced more climate changes than we do today.
B) Due to changes in climate, they were forced to travel between food patches.
C) They could cover more ground than their quadrupedal peers because they used less
energy.
D)They could travel longer distances on the ground than those who could use less energy.
答案與題解：
1. C 短文的第一段直接回答了這個(gè)問題。
2. B worked out在此是"運(yùn)動(dòng)，鍛煉"的意思，所以選擇 B。
3. D 第五段的第三、第四和第五句提供了答案。bipedalism was more expensive的意思是：兩足行走消耗更多的體能。walking upright的意思是：直立行走，即兩足行走。
4. B 第六段告訴了我們研究的兩個(gè)假設(shè)：猿人祖先在解剖學(xué)意義上存在著差異，這一
差異影響了它們的步態(tài)；這些差異在自然選擇的過程中決定了遺傳變異，而環(huán)境變化使得兩足行走的猿人比起四足行走的猿人更有優(yōu)勢(shì)。A、C、D都不是正確的說法，只有B在該段中被提到。
5. C 倒數(shù)第二段提供了問題的答案。travel longer distances用的是比較級(jí)，這里是將兩足行走的猿人與上文中四足行走的猿人做比較。those who could cover more ground using less energy指的是上文提到的與四足行走的猿人相比，體能消耗較小的兩足行走猿人。其他選擇都不是正確說法。