1岁小儿生长发育中
体重为（）
A.9kg
B.6kg
C.7kg
D.8kg
E.12kg
参考答案：A
1+2+4+8+16+32+64+128+256+512+1024=______．
There _____ no use to ask him this question.[ ]
A. were
B. is
C. are
D. was
