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【简答题】
已知a 2 +2a+b 2 -4b+5=0，求a，b的值．
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【判断题】P eople buy insurance through an insurance agent or broker to assist in their purchase.
A.
正确
B.
错误
【简答题】a sum of money paid regularly to an insurance company to protect sb. against some risk of loss or damage The employers make the employees pay for a large portion of their health insurance p .
【简答题】独立分配规律的实质在于控制两对性状的_____基因,分布在不同的同源染色体上,减数分裂时,每对_____染色体上等位基因发生分离,而位于_____染色体上的基因,可以自由组合。
【单选题】How did it ________ that the ancient building was burnt down in an hour?
A.
happen
B.
occur
C.
take place
D.
come about
【简答题】A．How primitive people used flags. B．What the ancient means of communication was. C．Why the torch towers were built. D．How the Great Wall came into being.
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