已知同温同压下等体积的不同气体含有相同的分子数，又知空气中混入氢气的体积达到总体积的4%﹣74.2%时点燃就会发生爆炸，下面列出了氢气混入空气时所占的不同体积分数，按理论计算最猛烈的可能是（提示：氢气与氧气完全反应时爆炸最剧烈）  [ ]

A．氢气占10%

B．氢气占29%

C．氢气占50%

D．氢气占70%

My parents and I are flying to London for a holiday and I’ll          the chance to practice my spoken English.

A．come up with

B．make use of

C．get along with

D．get tired of