单项选择题

A．Whatever
B．Whichever
C．Whenever
D．Wherever
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单项选择题
A．To show how simple the mechanical aids for diving can be.B．To provide an excuse for his changeable characterC．To explore the philosophical issues of space travel.D．To explain why he took up underwater exploration.
A．To show how simple the mechanical aids for diving can be.
B．To provide an excuse for his changeable character
C．To explore the philosophical issues of space travel.
D．To explain why he took up underwater exploration.
单项选择题
A．They both attract scientists’ attention.B．They can both be quite challenging.C．They are both thought-provoking.D．They may lead to surprising findings.
A．They both attract scientists’ attention.
B．They can both be quite challenging.
C．They are both thought-provoking.
D．They may lead to surprising findings.
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