(单选题)
The masses of ______ proton and ______ neutron are nearly equal.
A.the; the
B.the; a
C.a; the
D.a; a
参考答案：A
参考解析：
考查定冠词the的用法。句意：质子和中子的质量几乎相等。proton和neutron都是可数名词，因为masses前有冠词the，所以后面两种物质也都是特指，所以两空均填the。故选A。
知识点：
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