各国中央银行都对本国货币以流动性大小为标准做出了层次划分。我国货币划分为四个层次。

有机物 A 的分子式为C₃H₆O₂，水解后得到一元酸 M 和一元醇N， 已知M、N的相对分子质量相等，则下列叙中正确的是（     ）

A．M中没有甲基

B．N能发生银镜反应

C．M中含碳40%

D．N分子中没有甲基

西汉主要用木材建造椁室，称( )。

A．黄肠题凑

B．砖石宝券

C．宝城宝顶

D．松柏常青

凡从事生产、经营的纳税人应自领取营业执照或发生纳税义务之日起30日内按照国家有关规定设置账簿。( )

根据课文内容填空,每空一词.

     But how could the _1_____ believe it was natural? Everywhere they looked nearly everything was

___2___. All of the city's hospitals, 75% of its factories and buildings and 90% of its homes were

___3___. ___4___ covered the ground like red autumn leaves. No wind, however, could blow them

away. Two dams fell and most of the bridges also fell or were not safe for travelling. The railway

___5___ were now useless pieces of steel. Tens of thousands of cows would never give milk again.

Half a million pigs and millions of chickens were dead. Sand now filled the wells instead of water.

People were ___6___. Then, later that afternoon, another big ___7___ which was almost as strong

as the first one shook Tangshan. Some of the rescue workers and doctors were ___8___ under the

ruins. More buildings fell down. Water, food, and ___9___ were hard to get. People began to wonder

how long the ___10___ would last.

伟达商场规定其下属的百货、家电、食品等承包组对外开展业务时可以使用伟达商场的名义和公章，但发生的债权债务概与商场无关。1999年11月2日，该商场百货组以伟达商场的名义，与时尚服装厂签订一份购买5万件服装的合同，合同约定由百货组自行提货，签约后6个月内一次性付清货款。为担保合同的履行，在合同签订时，双良商场书面承诺对该合同买方所承担的货款义务负保证责任。此外，百货组还以伟达商场的名义，将商场的4辆汽车向时尚服装厂作了抵押，并办理了抵押登记。 11月5日，百货组派人到时尚服装厂提货，该服装500件一包，服装厂装货人员共装运了 105包服装，双方人员当时均未察觉。货车回商场途中与一辆运煤车相撞起火，车上服装全部被烧毁。
根据上述案情，回答下列问题：