问题标题：
【SAT语法题,Somescientistsbelievethatmentallystimulatingactivitiesmayincreasethenumberofbraincells（availabletoreplaceifany）arelostthroughaging.请问维护森么括号里的要改成availabletoreplaceanythat,我不是】
问题描述：
SAT语法题,
Somescientistsbelievethatmentallystimulatingactivitiesmayincreasethenumberofbraincells（availabletoreplaceifany）arelostthroughaging.请问维护森么括号里的要改成availabletoreplaceanythat,我不是很明白!
骆成凤回答：
注意断句噢.
braincells(省略了个that)availableto...--这是个定语从句
toreplace...
anythatare...--又是个定语从句
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