A:①②
B:①③
C:①④
D:②④
下列关于催化剂的说法正确的是( )
将左右两部分搭配,使其成为通顺的句子。
①Is she in the study?____ A. It's on the desk.
②Is this your bedroom?____ B. No, they aren't.
③Where's my pen?____ C. No, it isn't.
④Are they on the chair?____ D. Yes, she is.
⑤Where are my books?____ E. They are on the bed.
你的质量是 ____ kg,请计算你的重力是多少N?(g取10N/kg) ____
题目:一种动物(或题目自拟)
要求:1.表现动物伟大的母爱。2.围绕中心把内容写具体,语句通顺。(450字左右)