—Why didn't you cry for help when you were robbed (被抢劫)?
—If I opened my mouth, they might find my four gold teeth. That would be !
被子植物的受精过程依次是（ ）
①精子与卵细胞、中央细胞结合；②花粉管伸入子房；③花粉管进入胚珠；④花粉粒萌发出花粉管；⑤花粉管顶端破裂，释放出两个精子．
一活动小组在某山山脚测得的温度为22℃，山顶为16℃，请你说说该山的相对高度为（ ）
