⑴Can I help you? ____ A. Of course.
⑵Are they OK?____ B. Yes.
⑶Can I try them on?____ C. Thank you.
⑷Here you are!____ D. No. They're too small.
关于香港,说法不正确的是( )
A) 根据中文和句意,用单词的适当形式填空,每空一词。
某同学用如图所示器材探究“凸透镜成像规律”,此时光屏上成清晰的像,下列说法正确的是( )