—If I were you, I ______ for it last night instead of watching movies.
A:would prepare
B:prepared
C:had prepared
D:would have prepared
若x2+kxy+16y2是一个完全平方式,那么k的值为( )
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( )
选择恰当的应答语。
A.She b my sister.
B.Nice to meet you,too.
C.Wow! It has a long nose.
D.Ten.
E.OK!