【单选题】
A <{p}><{font _mstmutation="1" _msthash="20512" _msttexthash="4050527"}>不变<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msthash="20513" _msttexthash="12454793"}>不一定变动<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msthash="20514" _msttexthash="13000377"}>同方向变动<{/font}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msthash="20517" _msttexthash="12994644"}>反方向变动<{/font}><{br/}><{/p}>
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