单项选择题

It was unimaginable that they should have travelled across such an ______ area to look for a lost lamb.

A．extensive
B．expensive
C．expansive
D．intensive
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单项选择题
When we left, he again expressed his ______ of our timely help.
A．gratefulness
B．appreciation
C．expectation
D．anticipation
单项选择题
______ at from outer space, the Earth is just like a ball hanging in the universe.
A．Having looked
B．Looking
C．Looked
D．Having been looked
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