红星小学组织少先队员从学校去香山秋游，途中设甲、乙两个休息站．少先队员到达甲站时

根据短文内容，判断对"√" "×"。

                                                                   A Letter

Dear Mother,

     I'm writing to you from our hotel at Golden Beach. Jim and I are on vacation with the children for

a week, we aren't happy. We are having some problems.

    The weather isn't good. It's cold and cloudy. Now I'm looking out of the window and it's raining

cats and dogs.

    Tony and Tommy aren't very happy. They are having a terrible time. They

can' t play outside. They are sitting on the bed. playing cards and watching TV.

     Jim is at the doctor's office . He has got a headache.

     We are going to be back on Thursday.

     See you soon.

                                                                                                                                             Love,

                                                                                                                                             Ethel   

( )1. Ethel and Jim are on their vacation.

(     )2. The children are very happy.

(     )3. There are many cats and dogs out of the window.

(     )4. Tom and Tommy are playing outside.

(     )5. Ethel has got a headache.

世界银行《咨询服务采购指南》规定了世界银行贷款项目咨询服务采购的方式，其中不鼓励使用需要批准和在贷款协定和项目协定中规定的方式为( )。

A．基于质量的选择

B．基于资格的选择

C．预算固定选择

D．单一来源选择

作为推行“低碳经济”的重要科技进步，太阳能光伏发电成为2010年上海世博会的“亮点”。太阳能光伏发电最关键的材料是高纯硅，三氯甲硅烷(SiHCl₃)还原法是当前制备高纯硅的主要方法。生产流程示意如下：

（1）石英砂的主要成分是SiO₂，工业上制取粗硅的化学方程式为：SiO₂+2CSi+2R，R的化学式为______；该反应的基本类型是____________。

（2）整个制备过程必须达到无水无氧。在H₂还原SiHCl₃过程中若混入O₂，可能引起的后果是______________________。

（3）为了达到绿色化学和资源综合利用的目的，在生产过程中物质A需要循环使用，A的化学式是____。

科学技术鉴定

结合所学知识，你认为企业可以从哪些方面去规避采购风险？