A．the market is not efficient.
B．too many people go for it.
C．the prices are always fluctuating.
D．few people have the clear insights,
参考答案B
解析:
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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.
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.