当x=3时,代数式px3+qx+3的值是2008,则当x=-3时,代数式px3+qx+3的值为[ ]
A.-2002
B.2002
C.-2003
D.2003
答案:A
----Does Liu Hua serve in the army?
----No,but he ___in the army for three years.
A.served
B.has served
C.is serving
D.would serve
培育新品种应注意事项