单项选择题

An explanation of an earthquake is a description of the chain of ______ that produces it.

A．causality
B．margin
C．persistence
D．purpose
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单项选择题
He was present in his ______ role of school manager, church warden and donor.
A．dedicated
B．triple
C．providential
D．religious
单项选择题
Their experiments show that the ______ strain of wheat grows more quickly and is resistant to disease.
A．newly planted
B．newly cultivated
C．hybrid
D．imported
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