用这些a an are is these this it's what回答下面问题1.what (is) this?----this is an arm 2.what is (it's)?----It's (a)hand 3.what (are)these?-----(these)are feet 4.(what)is this ---------(this)hair 我做的哪一些对呀?

用这些a an are is these this it's what回答下面问题1.what (is) this?----this is an arm 2.what is (it's)?----It's (a)hand 3.what (are)these?-----(these)are feet 4.(what)is this ---------(this)hair 我做的哪一些对呀?
用这些a an are is these this it's what回答下面问题
1.what (is) this?----this is an arm 2.what is (it's)?----It's (a)hand 3.what (are)these?-----(these)are feet 4.(what)is this ---------(this)hair 我做的哪一些对呀?

用这些a an are is these this it's what回答下面问题1.what (is) this?----this is an arm 2.what is (it's)?----It's (a)hand 3.what (are)these?-----(these)are feet 4.(what)is this ---------(this)hair 我做的哪一些对呀?
第2个的问题部分错了 what is this
第4个的回答部分： It's
其余的都对了

2.What is (it)
4.(It's)hair
it's=it is
问句是this或that,回答时用it's

1.what (is) this? ----this is an arm 对
2.what is (it)? ----It's (a)hand 错
3.what (are)these? -----(These)are feet 对
4.(what)is this ---------(It's)hair 错