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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单项选择题
Cosmic rays of various kinds come through the air from outer space, but enormous quantities of radiation from the sun are ______ off.
A. avoided
B. excluded
C. screened
D. separated
单项选择题
Once the baby has mastered the idea that space is three-dimensional, it ______ out and begins grasping various kinds of objects.
A. shouts
B. reaches
C. aims
D. pull
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