对于封闭式基金，有必要对某一时点上基金证券实际代表的价值进行估值，并在此基础上得出基金证券的买价和卖价。()
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保险机构投资者按照每一保险产品开立1个证券账户。()
A. 正确
B. 错误
证券公司从事资产管理业务时，不得向客户做出保证资产本金不受损失或取得最低收益的承诺。()
A. 正确
B. 错误
The word "it" in line 21 refers to
A. formation
B. ice
C. thickness
D. weight
It can be inferred from the last paragraph that a glacier
A. can revert to a fluffy mass
B. maintains the same shape through out the glacial process
C. is too cold to be thoroughly studied
D. can contribute water to lakes, rivers, or oceans
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