Let me ____ (carry) it for you.
对达尔文自然选择学说的正确评价是( )
-- You see, it's my dream to buy __________ iPhone 6S.
-- Oh, you can ask your parents to buy __________for you.
函数fx=ln4+3x-x2的单调递减区间是( )
由于某种原因,某生物体内某条染色体上多了几个或少了几个基因,这种遗传物质的变化属于( )