具有叶绿素、叶黄素和胡萝卜素的应为:()
A.绿藻门植物
B.隐藻门植物
C.硅藻门植物
D.红藻门植物
参考答案:A
可可西里的藏羚羊保护者研究该地区藏羚羊的数量变化和繁殖情况,他们研究的是生命系统的哪一结构层次[ ]
A.个体
B.种群
C.群落
D.生态系统
Since our country has so many good table tennis players,we have to ________ the best ones to take part
in the game.[ ]
A. rely on
B. depend on
C. judge on
D. decide on