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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】How much sleep does a person need (31) the physiological bases of the need for sleep remain conjectural (猜想), rendering conclusive answers to this question impossible, much evidence has been gathered...
A.
unless
B.
however
C.
although
D.
even if
【单选题】How much sleep does a person need?【B1】the physiological bases of the need for sleep remain conjectural(猜想), rendering conclusive answers to this question impossible, much evidence has been gathered on...
A.
As
B.
Despite
C.
While
D.
Whether
【单选题】How much sleep does a person need (31) the physiological bases of the need for sleep remain conjectural (猜想), rendering conclusive answers to this question impossible, much evidence has been gathered...
A.
extend
B.
range
C.
alter
D.
rise
相关题目：
【判断题】导热的基本定律是四次方定律
A.
正确
B.
错误
【多选题】（）存款不能开立存款证明。
A.
进入AAS不规范个人账户处理系统的存款
B.
已做除存款证明冻结以外的其它冻结的存款
C.
礼仪存单
【单选题】当1，2，3，4，5，6时，比较和的大小并猜想（）
A.
时，
时，B.
时，
时，C.
时，
时，D.
时，
时，【判断题】孪生素数猜想已经被证明出来了。()
A.
正确
B.
错误
【单选题】四次方定律揭示了（）
A.
黑体辐射力与热力学温度的关系
B.
黑体辐射能按波长分布的规律
C.
吸收比与发射率之间的关系
D.
黑体辐射能沿空间不同方向分布的规律