下列反应可用于汽车尾气处理,其反应的微观示意图如下。下列说法正确的是( )
该反应的基本反应类型为置换反应
反应前后氮元素的化合价未发生改变
参加反应的甲与生成的丁的分子个数比为 2 : 3
反应前后原子种类,分子种类都没有发生改变
Since we began to use the Internet,our lives a lot.( )
A.changeB.had changed
C.will changeD.have changed
Would you like to see a movie with me on Saturday night?
Sorry,I didn't it.Could you please say it again?( )
receive
catch
find
finish
I want to buy a shirt.But I have a little money.
The shirts here are all very cheap.And the yellow one is .Do you like it?( )
cheap
cheaper
the cheapest
expensive
I've just returned from my trip to London.I many interesting places there.( )
visit
will visit
am visiting
visited
Do you have any for tonight yet?
Not yet.What about having a picnic on the beach?( )
problems
news
plans
rules