My parents expected too much of me. When they heard that I had failed in the college entrance

examination, they almost _____. [ ]

A. broke up

B. broke off

C. broke out

D. broke down

下列哪种现象不是生物适应环境的例子：

A．旗形树的树冠像一面旗帜

B．荒漠生活的骆驼尿液极少

C．营养不良导致发育不良

D．蝗虫体色与环境相近