-- What a nice watch! How long you it?
-- For just two weeks.
A:will; buy
B:have; had
C:were; having
D:did; buy
____ ____ the____ !
有人说:“鸟的全身都为飞行而设计”.下列选项中除哪项外,都是鸟类适于飞行的特点( )
漫画《重组》启示我国政府机关工作人员要( )
先化简: xx+3 ÷ x2+xx2+6x+9 + 3x−3x2−1 ,再求当x+1与x+6互为相反数时代数式的值.