如图是硒元素的原子结构示意图,有关说法不正确的是( )
A.n的值为6B.Se在第四周期
C.Se是一种金属元素D.Se的质子数是34
--- Can you tell me ______ on the Internet? --- OK, mum.
Thousands of houses _______ by the floods in Guangxi last month.
more, and you'll improve your spoken English.
--- I've just got a postcard from my pen friend. --- Let me have a look. Wow.nice card!
--- What is your favourite sport? --- Swimming, I think. It's of all.