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
A．Even ifB．BecauseC．IfD．For
A．Even if
B．Because
C．If
D．For
单项选择题
When Mrs. McGuillicuddy’’s train passed through a station, it_______.
A．gained speed suddenly.
B．kept its usual speed.
C．changed its speed.
D．stopped immediately.
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