金银天然是货币，货币天然是金银。
错
在货币产生前，金银只是一般的商品，由于金银的特点最适合充当货币，因此，货币天然是金银，而金银天然不是货币。
Many British people have noticed that butterflies _______ from its natural habitats during the past several years.
A．are disappearing
B．have been disappeared
C．have been disappearing
D．will have disappeared
以下何故障会引起故障灯亮（）
A、FCU电磁活门故障
B、超速保护电路失速
C、超速
D、APU燃油关断活门故障
