2+4+6+8+10+12+14的值为( )。
A．56
B．58
C．60
D．62
参考答案：A
5.4747…是______小数，用简便记法写着______．
He promised to come yesterday, but he hasn't ________ yet.[ ]
A．turned down
B．turned out
C．turned up
D．turned to
