单项选择题

We shall probably never be able to ______ the exact nature of these sub-atomic particles.

A．assert
B．impart
C．ascertain
D．notify
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单项选择题
The commission would find itself ______at every turn if its members couldn' t reach an agreement.
A．collided
B．savaged
C．crumbled
D．hampered
单项选择题
A．boundlessB．changeableC．limitlessD．ceaseless
A．boundless
B．changeable
C．limitless
D．ceaseless
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