A、<span style=";font-family:宋体;font-size:16px">逐渐减少；</span></p><p></p>
B、<span style=";font-family:宋体;font-size:16px">逐渐增多；</span></p><p></p>
C、<span style=";font-family:宋体;font-size:16px">不变；</span></p><p></p>
D、<span style=";font-family:宋体;font-size:16px">无法判断。</span></p><p></p>