受到碰触时，含羞草展开的叶片会合拢，这说明生物具有下列哪一特征？（ ）
A．能对刺激作出反应
B．能进行光合作用
C．能产生运动
D．能进行呼吸
生物具有一下特征：1、生物的生活需要营养．2、生物能够进行呼吸．3、生物能排出体内产生的废物．4、生物能够对外界刺激作出反应．5、生物能够生长和繁殖．6、除病毒外，生物都是由细胞构成的．受到碰触时，含羞草展开的叶片会合拢，体现了生物能够对外界刺激作出反应．
故选：A．
| 用所给词的适当形式填空，每词限用一次。 | |
2. —How old were you when you ________ learning English? —Ten years old. 3. The 2008 Olympic Games ________ in August in China. By then lots of athletes and tourists are coming for it. 4. —Where is Dave? —He________ clean up the city parks with other volunteers. 5. —Are you going to the film "King of Kongfu" with us? —No, thanks. I ________ it. 6. Last night he found it difficult ________ because of the loud noise outside. 7. He works par-time by ________ advertisements in the supermarket. |