数量性状与质量性状的遗传特点有何不同。（8分）

---What are the people in Korea supposed to do when they meet for the first time?

--- They are supposed to _______.

A．kiss

B．bow

C．say hello

D．shake hands

一个正方体的棱长扩大到原来的2倍，体积扩大到原来的[ ]

A．2倍

B．4倍

C．8倍

下图为我国华南某河流下游剖面示意，读图回答下题。

当河流水位最低时，该河流的河口地区可能出现的自然灾害是

A．水土流失

B．滑坡

C．咸潮

D．凌汛

Tom was so wild about computer games that he would stay online for ten hours _____every day.

A．in the end

B．in particular

C．on end

D．on purpose

保险合同成立后，除法律另有规定或者保险合同另有约定外，( )不得解除保险合同。

A．投保人

B．受益人

C．被保险人

D．保险人