单项选择题

New data has ______ that the damage to the ozone layer is not confined to the southern hemisphere.

A．ratified
B．confirmed
C．assured
D．approved
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单项选择题
President Bush's visit was planned to ______ 30th anniversary of President Nixon's visit to Chin
A． depend onB. adhere toC. coincide withD. cling to
单项选择题
We made plans for a visit, but ______ difficulties with car prevented it.
A．subordinate
B．succeed
C．successive
D．subsequent
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