干扰素是治疗癌症的重要药物，它必须从血中提取，每升人血只能提取0.5μg，所以价格昂

应警惕胰腺癌的症状和体征包括（）。

A.腹部包块

B.消化不良

C.黄疸

D.腹痛

E.发热

Please be quick, or we will have no time ____ have lunch.

A．to

B．in

C．on

D．/

An analyst does research about liquidity. Which of the following statements about liquidity is least accurate（）

A. A decrease in a dealer's bid-ask spread decreases in liquidity.

B. On-the-run U. S. Treasury securities provide more liquidity than off-therun U. S. Treasury securities.

C. Standard practice for pricing liquid bond is a pricing service of dealer price quotas.

简述直接头脑风暴法的步骤。