题干
A：I like this doll. It can sing. It's cool.
B：I like this ball. It's red and white. It's nice.
答案(点此获取答案解析）
A
A：I like this doll. It can sing. It's cool.
B：I like this ball. It's red and white. It's nice.
3Fe+4CO2中的还原剂是（ ）
② 
③ 
④C2H4 ⑤CH2=CH﹣CH=CH2⑥C2H6⑦ 
⑧ 