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【单选题】
下列选项中，关于参数优化的说法，正确的是（）。A.
参数优化就是通过寻找最合适的模型参数使交易模型达到最优绩效目标的优化过程
B.
参数优化可以在长时间内寻找到最优绩效目标
C.
不是所有的量化模型都需要进行参数优化
D.
参数优化中一个重要的原则就是要使得参数值只有处于某个很小范围内时，模型才有较好的表现
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【单选题】Women are bad drivers in all the following ways EXCEPT
A.
they drive too fast
B.
they often do their makeup in the car
C.
they use too much cell phone in the car
D.
they often miss traffic signals when there is another woman in the car
【单选题】Why didn’t they drive the bear away?
A.
Because the bear was too big.
B.
Because it was dangerous to drive a bear away.
C.
Because the bear ate everything they had.
D.
Because they wanted to play with the bear.
【简答题】A．They could drive the insects away. B．They could keep the plants well-watered. C．They could build devices to trap insects. D．They could protect the plants from severe droughts.
【简答题】A．They could drive the insects away. B．They could keep the plants well-watered. C．They could make the plants grow faster. D．They could build devices to trap insects.
【简答题】Today’s drivers may feel shocked by the high price of petrol when they drive to the gas station. However, the car industry has the technology to solve the problem . It’s the hybrid car（混合动力汽车）. What i...
【简答题】A．They could drive the insects away. B．They could keep the plants well-watered. C．They could make the plants grow faster. D．They could build devices to trap insects.
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