选不同项。
①____A.breakfast B.library C.dinner
②____A.thirty B.forty C.second
③____A.China B.London C.Sydney
④____A.jump B.run C.kid
⑤____A.chicken B.juice C.milk
四川盆地与长江中下游平原的分界线是( )
- I don't know Kate's address. Do you know _______?
- Sorry, I don't know, either.
某电子在一匀强磁场中沿垂直于磁场方向运动,以下说法正确的是( )