The United States _______one of the lowest smoking rates －25.5 percent of the population.
A．isB．haveC．hasD．a(chǎn)re
C
考察主謂一致.句意:美國有最低的吸煙率_人口的22.5%. be動(dòng)詞的意思是,故用have沒The United States指的美國,為第三人稱單數(shù),故謂語動(dòng)詞用單屬形式,選C.
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：單選題


一Why are you so excited，John?
—Our class got the first prize in the singing contest at last，which we        forward to．
A．have been lookingB．had been looking
C．lookedD．had looked

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Scientists still wonder whether cloning will help or harm us and where it ____ us.
A．has ledB．is leadingC．had ledD．would lead

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題


If a computer crashes，you will lose the file you _____ on if you don’t save it early enough.
A．a(chǎn)re workingB．workC．will workD．worked

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題


.He said he _________ experiments those days.
A．was doingB．had been doingC．has been doingD．is doing

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題


My grandfather ___to be quite afraid to live in the city, but now he has __ to the life here.
A．used; usedB．was used; got used
C．used; got usedD．got used; been used

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

---What are you doing ,Jack?
---I’m making a model car. I _______ it in the science class at 10 o’clock tomorrow morning.
A．will be showing
B．would show
C．have shown
D．show
 

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題


The company designed a new car last month and about 500 cars of this type       in the factory next month.
A．were producedB．will produce
C．have been producedD．will be produced

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題


. By the year 2020 scientists _____ a lot of research on AIDS.
A．had doneB．doC．a(chǎn)re doingD．will have done

查看答案和解析>>

同步練習(xí)冊答案