A:a
B:and
C:but
D:or
⑴What colour is her dress ?____ A、It's Mike's .
⑵What time is it now ?____ B、It's white and black .
⑶Whose is this ?____ C、They are apples .
⑷What are they ?____ D、No , she isn't .
⑸Is your mother at home ?____ E、It's five o'clock .
一种大米的质量标识为“50±0.25千克”,则下列大米中合格的有( )
如图所示是一种水翼船,船体下安装了水翼.当船在高速航行时,水面下的水翼会使船身整体抬高离开水面,从而减小水对船的阻力.则水翼安装正确的是( )
○○□□□○○□□□○○□□□○○□□□○○……从左往右数,第7个是____,第20
个是____。