微晶蜡的对分子量、相对密度、粘度及折射率等都比石蜡()。
A、低
B、好
C、高
D、坏
参考答案:C
(2014·沧州模拟)—I regret________you John has been fired.
—I can hardly believe my ears.He’s such a fine worker.
A.telling
B.having told
C.to tell
D.to have told
Jimmy was so nervous not a single word _____ down in the dictation.
A.he wrote
B.he was written
C.did he write
D.was he written