—How many ________ are there on the table?
—Three. Are you thirsty? Let's cut one and eat it.
A:onions
B:ducks
C:watermelons
D:sandwiches
如图,已知∠1=∠2,欲得到△ABD≌△ACD,还须从下列条件中补选一个,错误的选法是( )
“验证绿叶在光下制造淀粉”的实验中,第一步把植物放到黑暗处一昼夜的目的是( )