What does the verb form of the word "renovation" mean in ParA．1.（）
A. Reform.
B. Rearrange.
C. Retreat.
D. Restor
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Scientists ______ that there is no animal life on Mars.
A. ensure
B. assure
C. resume
D. assume
64（）
A. with
B. to
C. for
D. in
硝酸盐在存放时能与下列哪种物质放在一起( )
A. 乙酸乙酯
B. 氯化亚锡
C. 硫氰化钡
D. 硝酸
80（）
A. event
B. chance
C. occasion
D. affair
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