Unit 4 Earthquakes using language课时作业

Ⅰ.单句语法填空

　　1．We call air a________(mix) of gases.

　　答案：　mixture

　　2．He ________in chemistry at college years ago，and now the________of his work is something to do with that field.(major)

　　答案：　majored；majority

　　3．The manager had no ________(react) to the argument between the two workers.

　　答案：　reaction

　　4．People of different races have different________(race) customs.

　　答案：　 racial

　　5．The________worked together to fight against________.(slave)

　　答案：　slaves；slavery

　　6．The government announced additional rules on________(immigrate)．

　　答案：　immigration

　　7．Today there are about 25,000 Russian­Americans________(live) in and around San Francisco.

　　答案：　living

　　8．People from Africa________(live) in California since the 1800s，when they ________(move) north from Mexico.

　　答案：　have been living；moved

　　9．In more recent decades，California________(become) home to more people from Asia，________(include) Koreans，Cambodians，Vietnamese and Laotians.

　　答案：　has become；including

　　10．California also has the distinction of being the most multicultural state in the USA，________(attract) people from all over the world.

　　答案：　having attracted

　　11．In addition，many people died of the diseases________(bring) by the Europeans.

　　答案：　brought

　　12．My father________(hire) three men to help him with the harvest last summer.

　　答案：　 hired

　　Ⅱ.完成句子

1．She tried to explain________________________(通过) sign language，but we still couldn't understand what she meant.