—Grace,come and have a hamburger. —No,thanks.I don’t want to be. A.fat B.tall C.old D.thin
书面表达假如你是Helen，下面是你周四一天的学校生活。请用英语写一封信将你忙碌的一天告诉你的朋友辛迪(Cindy)。Alan's Thursday8：30Chinese9：00science10：0
Is sport always fun ? One afternoon in the last week of term, I saw three children form my son’s school in tears being comforted by teachers. That morning, my 11-year -old had stomach pains and (2
从工业化时期迅速崛起为领导城市，到沦为二战后萎靡不振的老工业城市，后经过著名的“匹兹堡复兴”而成为面目一新、充满勃勃生机的后工业化白
做空气中氧气含量测定的实验装置如右图。 下列有关说法正确的是 A．使用红磷的量越多，最终进入集气瓶的水也越多 B．本实验可以证明空气
Children’s brains can’t develop properly they lack protein A. when B .since C. because D. unless
，则
__________．
∴
=
=-2， 
=f(-2)= 
=
.