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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】If those "mad moments"— when you can’t recall what your friend has told you or where you left your keys—are becoming more frequent, mental exercises and a healthy brain diet may help. Just as bodies r...
A.
everyone can be forgetful sometimes regardless of one’s age
B.
we can prevent our sound mind from aging with certain methods
C.
brain aging starts from the time when we are in our 20s and 30s
D.
memory loss is a sign that shows we are getting old
【多选题】通常家长进课堂的类型 ( )
A.
家长作为参观者进入课堂 ，了解幼儿园的保教活动和 孩子在幼儿园集体活动中的表现
B.
家长作为志愿者，以“教师”的身份进入到孩子的活动环境中，用他们的兴趣、特长、行为和能力去影响孩子， 增进家长和教师的相互信任与理解，在家长和老师互补的过程中形成教育合力
C.
家长在外面悄悄地观察孩子
D.
家长在外面悄悄地观察老师