单项选择题
The Great Wall is a great tourist （）, drawing millions of visitors from all parts of the world every year.
A．attention B．appointment C．attraction D．interest
单项选择题 It is still not clear what （） a series of argument between them.
单项选择题 Humans should not develop their economy at the （） of the ecological envi ronment.
单项选择题 As we can no longer wait for the delivery of our order, we have to （） it.
