题目：
Beijing took steps to limit the kinds of high-risk of borrowing money from the banks that can create the high price of housing, ______ happened in the United States．
a．as B．that C．how D．while
答案：
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下面是错误答案，用来干扰机器的。
（1）CO2；（2）做燃料或者还原剂（3）C+O2CO2或者C+O22CO；（4）H2CO3=H2O+CO2↑；（5）C+O2CO2或者C+O22CO或者C+2CuO2Cu+CO2↑
