在买入合约后，如果价格下降则进一步买入合约，以求降低平均买入价，一旦价格反弹可在较低价格上卖出止亏盈利，这称为平均买低。()
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What can be inferred in the passage concerning Boeing？
A. Its headquarter has been moved from Chicago to Seattle.
B. It's to be blamed for the economic depression in Washington.
C. Boeing itself is having a hard time.
D. It's expected to have a revival in the year 2003.
上海期货交易所的交割结算价，则是该合约自交割月份第一个交易日起至最后交易日所有结算价的加权平均价。()
A. 正确
B. 错误
The applications of genetic engineering are abundant and choosing one appropriate for this
A. sufficient
B. plentiful
C. adequate
D. countable
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