A．profit opportunities remain a very brief time.
B．only experts can grasp the profit opportunities.
C．people without insights don't get much profit.
D．anyone who knows the hot tips can gain profit.
参考答案A
解析:
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A．Doubtful.
B．Cautious.
C．Consenting.
D．Ironic.
A．the explanation of efficient market.
B．the exchange of different currencies.
C．how to make profits from stock market.
D．how to catch the profit opportunities.
