Unit1课内练习答案（P3 Comprehending 1）1. First settlers crossed the Bering Strait in the Arctic to America. These people are now known as Native Americans.2. Spanish soldiers arrived in South America.3. California became part of Mexico.4. The US declared war on Mexico.5. Gold was discovered in California.6. California became the 31st state of the US.P3Ex.2第一行：in the early 16th centuryearly 1800s1800s第二行：late 1840s / early 1850sin the late 19th century1911第三行：1920sbeginning of the 20th centuryfrom about the 1970s第四行：from about the 1970sin more recent decadesfrom about the 1970sP4Ex.1（learning about language）Adjective major Italian hard Korean racialPakistani distinct DanishNoun majority Italy hardship Korea racePakistan distinction DenmarkP4Ex.21federal 2Catholic 3majority 4Ministry 5boom 6Italy 7distinction8hardships 9Korea 10electedP4Ex.3Arctic, Strait, crossing, by means of, rail, making a life, aircraftP5 Ex.3；P6Ex.2P5 Ex.31---62---43---54---35----76---27---88---1P6Ex.21. He started in northern California, and he has been travelling south.2. The facts that not everybody is rich, not everybody lives on the coast, and the desert in California is not like the rest of the climate of California, surprised him.3. He had watched too many American movies.4. Many people from different countries moved to California. Theybrought their own customs, culture and food. They kept them up and so produced the large variety of food, music, customs, art and cultural activities.P6Ex.3southeastern California American movies beach / coast cotton, vegetables, nuts southeast desert races festival, musicP7Ex.11Wednesday (Angel Island) 2Monday (Fisherman’s Wharf) 3Tuesday (Chinatown)4 Tuesday(blue and white road sighs) 5Wednesday ( Golden Gate Bridge) 6 Monday (cable car)P9Ex.21 He invented the cable car system because the horse-drawn trams used before were unsafe.2 He ate at Fisherman’s Wharf.3 It was convenient for him to tour around the city. It was cheaper to hire a car with other people because they could share the coast. Also he probably enjoyed being in the company of other tourists.4 Eat in Chinese restaurants, go to markets, visit temples and museums.5 It was famous as a place for immigrants to be checked before they could enter California.Workbook练习题答案（P46Ex.1）1Traveller’s Tales 2Tom Price 3Mandy Long 4New OrleansP46Ex.31F2T3T4F5T6T7F8T9TP47Ex.41. (略)2. hot and humid3. 1812 Louisiana became a state of the USA.1857 The first Mardi Gras celebration was held.4. CP48Ex.1a great many, applying for, nephew, ferry, Immigration, Apparently, bakeries, occur, thankful, fascinatingP48Ex.21take in 2reform 3had marked out 4team up with 5back to back6applicants, 7customsP48Ex.31. When he arrived at the hotel, the first thing he wanted to do was to leave his luggage / baggage, have a shower and shave, and then walk around.2. My grandpa was a socialist who believed in socialism all his life.3. Many illegal immigrants felt that their stay in America was like a punishment because only a few of them got justice and were allowed to live there.4. The civil authorities tried to reduce the noise made by seagulls but failed.5. Many English farmers mourned their cattle which had to be killed because of “mad cow disease”.6. My house is nowhere near the center of the city, but it has no air pollution or traffic jams. / Although my house is nowhere near the centerof the city, it has no air pollution or traffic jams.P49Ex.11how (OC) 2What (SC) 3whether (OC) 4what / which (OC) 5what (SC) 6That (SC) 7Why (SC) 8why (OC) 9When (SC) 10 as if (PC) 11 where (/ why (PC) 12How (SC) 13 why (PC) 14 that(PC) 15 whether (OC)P49Ex.21. it is used as the subject, object, predicative or appositive in a sentence2. it is used as an attribute modifying a noun, a pronoun or a sentenceP50Ex.31. sad2. the coffin was taken to the graveyard to be buried.3. serious4. after the body has been buried and the people are leaving the graveyard5. begins singing and dancing6. celebrate the life of the person who has just diedP52Ex.2P52Ex.3Achievements:Learned to play drums and trumpet at age 12;Got a job in best band in town at age 16;Started making records at age 23;Became a huge star and remained popular for almost 50 years; Acted in over 50 movies;Became a goodwill ambassador for the USA;Took part in the civil rights movement.Good qualities：Even though he was poor, he never turned to crime to make a living; He was a great musician;He loved entertaining people;He could communicate with people from all sorts of backgrounds; He cared about civil rights issues;He lived a simple life despite his rights and fame;He continued to work all his life.Unit2课内练习答案（P12Ex.1）1. The first use is to produce commercial quantities of plants. The second is to research on new plants specials and do medical research on animals.2. Cloning plants is straightforward, but the cloning of animals is very complicated.3. The first clone from an adult animal was Dolly the sheep. She died in 2003.4. Cloning is controversial in some countries for moral and religious reasons.P12Ex.2Problems or dangers of cloningEvil leaders may want to clone themselves.Animal clones may develop the illnesses of older animals.Animal clones may die younger than the donor animals.There are moral objections to cloning human being.Advantages of cloningMedical cloning could produce cures for serious illness in humans. Cloning plants can be useful for research on new plant species.Cloning plants can produce plants of similar quality for sale.Cloning can help save endangered animals.P12EX.3I think the writer is impartial because he / she does not state any personal opinion about cloning.P13Ex.11differ 2cast 3accumulate 4exact 5altogether 6objections 7un dertake 8moral.P13Ex.21 straightforward2 arbitrary3 commercial4 made an objectionto 5 obtain 6 will forbidP13Ex.31attain 2complicated 3fate 4carrier 5cast 6reform 7accumulateP14Ex21997年多莉羊诞生的消息宣布后便成为一项科学突破。