香港和澳门都很重要的经济支柱是
[ ]
A．对外贸易
B．博彩业
C．旅游业
D．金融业
答案：C
______ I was surprised at ______ her positive attitude towards life after losing her legs.
A．How, is
B．That, was
C．What, were
D．What, was
通气/血流比值（ventilation/perfusion ratio）
