题目内容

具有( )、( )( )结构的黄酮类化合物,可与金属盐发生络合反应。常用的铝盐是(三氯化铝 )。

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When ___________, you’ll experience different “local” times.

A. travelled
B. travelling
C. travels
D. travel

___________a little about the local culture can prevent a lot of frustrations.

A. Knowing
B. Know
C. Knew
D. known

Remember that it’s important _________ with the flow.

A. going
B. goes
C. to go
D. to have gone

After 10 pm, a tourist __________for a hot meal in Switzerland just might go hungry.

A. hopes
B. hoping
C. hoped
D. hope

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