影响基差的因素有哪些？
参考答案：
影响基差的因素有持仓费和供求关系，替代产品的供求状况以及仓储费用、运输费用、保险费、上年结转库存。
A turning point of the continuously high housing price won’t appear suddenly because there must be a certain process ______ many factors lead to the change.
A．which
B．what
C．where
D．that
简述板块构造的基本观点。
