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【简答题】Mr Ding picked up a handbag lost by somebody when he was walking in the park. There was lots of cash, some bills of exchange and a set of commercial documents in the handbag. Mr Ding found, from the i...
【单选题】________in the street,his glass fell on the ground. A.When walking B.When walked C.When he was walking D.He was walking
A.
When walking
B.
When walked
C.
When he was walking
D.
.He was walking
【简答题】Ⅰ．乙基香草醛（ ）是食品添加剂的增香原料，其香味比香草醛更加浓郁． 写出乙基香草醛分子中两种含氧官能团的名称______． Ⅱ．乙基香草醛的同分异构体A是一种有机酸，A可发生以下变化： 提示：①RCH 2 OH Cu O 2 / H 2 S O 4 RCHO； ②与苯环直接相连的碳原子上有氢时，此碳原子才可被酸性KMnO 4 溶液氧化为羧基． （1）由A→C的反应属于______（填反应类型）．...
【单选题】___ in the street, he met an old friend of mine. A. When walkB. When walked C. When he was walking D. He was walking
A.
When walk
B.
When walked
C.
When he was walking
D.
He was walking
【单选题】What did the man hear when he was walking along the street?
A.
He heard someone shouting 'Help!'.
B.
He heard someone calling Jim Brown.
C.
He heard someone calling him.
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