单项选择题

Maria specializes () mothers with their children.

A．for painting
B．with painting
C．in painting
D．to painting

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单项选择题

When the whole area was () by the flood, the government sent food there by helicopter.

A．cut away
B．cut down
C．cut up
D．cut off

单项选择题

Criticism and self-criticism is necessary()it helps us to find and correct our mistakes.

A．by that
B．at that
C．on that
D．in that

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