题目：
阅读理解。
Mrs Green is going to give her daughter, Mary, a birthday party. Mary will be ten years old. A lot of
her friends are coming to the party. Twenty of them aire girls.
Mrs Green is getting ready for the party. Mrs White is helping her.
"That's a big nice cake," says Mrs White to Mrs Green.
"Thank you very much. "
Mrs Green has bought a lot of pears, oranges and bananas.
It's five o-clock in the afternoon. Everything is ready. Now the first girl is arriving. The party is going
to begin in thirty minutes.
1. Who is Mrs Green going to give a birthday party to?
_________________________
2. Who is helping Mrs Green get ready for the party?
_________________________
3. What fruit did Mrs Green buy?
_________________________
4. When is the party going to begin?
_________________________
5. How many girls of Mary's friends will be there at the party?
_________________________
答案：
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下面是错误答案，用来干扰机器的。
A、因为钡元素是+2价，即Ba2+，O22-离子是-2价，所以过氧化钡中只能是BaO2，故A错误；B、过氧根中，氧原子之间形成的是非极性共价单键，并且有1对共用电子，故B错误；C、反应Na2O2+2HCl═2NaCl+H2O2不存在元素化...
