单项选择题

Section A
Many companies are seeking to exploit and develop the rich natural______ regions．

A．sources
B．resources
C．materials
D．power
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单项选择题
The number of people invited______ fifty,but a number of them______ absent for different reasons．
A．were，was
B．was，was
C．was, were
D．were, were
单项选择题
______you’ve got an opportunity,you should take good advantage of it．
A．Now that
B．After
C．Although
D．As soon as
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