皮皮学，免费搜题
登录
搜题
【简答题】
现有A、B、C、D四种元素，A为地壳中含量最多的元素，B少量存在中，它燃烧产生的气体是导致酸雨的主要原因，C是组成有机物不可缺少的一种元素。D为人体中含量最多的金属元素。试回答： （1）A元素形成的一种单质_________， （2）C元素的名称_____________， （3）D离子的符号是_______________。 （4）含有B元素的煤在空气里燃烧产生酸雨的主要原因是_____________（用化学方程式表示）。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The girl wanted to end her life and ________all her worries in her world.
A.
get away from
B.
take away from
C.
keep away from
D.
break away from
【单选题】Even as a girl,___to be her life, and theater audiences were tobe her best teacher.
A.
performing by Melissa were
B.
it was known that Melissa’s performances were
C.
knowing that Melissa’s performances were
D.
Melissa knew that performing was
【单选题】Even as a girl, ____ to be her life, and theater audiences were to be her best teachers.
A.
performing by Melissa were
B.
it was known that Melissa's performances were
C.
knowing that Melissa's performances were
D.
Melissa knew that performing was
【单选题】Even though her talent was __________ to everyone who heard her sing,life got in the way of her dreams. [ ]
A.
apparent
B.
abundant
C.
absurd
D.
academic
相关题目：