单选题 The scientists have made an（）study of the virus that causes the disease.

单选题 The future of that country will be hard to predict （） the economic system is reformed .

单选题 Men differ from animals（） they can think and speak .

单选题 It is necessary that he （） the assignment 

without delay .

单选题 Which of the following shows the correct word 

stress for " encyclopedia "?

单选题 Sally was a bit shy , but her teacher found her 

quite（）discussing a recent film with others.

单选题 The letter string " t you " in the sentence " It 

doesn ' t fit you ." is pronounced as（）.

单选题 To make sure you get into the right （）while driving on a motorway,you must follow the road signs .