—Happy birthday! — _________
A:Thank you.
B:Happy birthday.
C:I’m nine.
单克隆抗体是指( )
我市几年前种下的许多绿化树苗已逐渐长高,植株内有机物大量增多。这些有机物来自植物的 ( )
下列关于人体运动系统的叙述,正确的是( )
如图,BD、CE相交于点A,下列条件中,能推得DE∥BC的条件是( )
You must make the bed every day.(改为同义句)
You ____ ____ make the bed every day.