成人英语三级

46. The investigation, _______ will soon be published, was made by John.

A. at which the results B. the results on which

C. whose results D. at whose results

47. _______ you return those books to the library immediately you will have to pay a fine.

A. Until B. Unless

C. If D. provided

48. Air, or ______ is called atmosphere, surrounds the whole earth.

A. it B. that

C. which D. what

49．_______ was pointed above, this substance can be used as a substitute.

A. It B. That

C. What D. As

50．_________ she finds out that you ’ve lost her books.

A. As if B. Even if

C. What if D. Suppose that

答案：46-50 CBDDC

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