我们能从各个方向看到花园里盛开的鲜花，这是由于光在鲜花表面 　 [] A． 发生

讨论方程sinx=x的实根个数。

下列关于风险净额的说法，正确的是______。

A．风险净额是保险人所给付的死亡保险金中，除了保单持有人自己的贡献外，保险人所承担的部分
B．终身寿险、两全保险等险种中，风险保额在保险期间内通常是保持不变的
C．万能保险的风险保额是保持不变的
D．以上说法都不正确

阅读短文，用括号内所给动词的适当形式填空。

     My sister always 1_______(like) having a short rest after lunch. Today she 2_______ (sleep) when the

telephone 3_______ (ring), she 4_______ (get) up quickly 5_______ (answer) it. One of her classmates said

to her,"This is xiao Ling. I'm downstairs of your home. I want to ask you something about our homework.

What 6_______you 6_______ (do) now?" My sister answered, "This is Li Hong speaking. Nothing much.

Come up please. You are welcome." Then my sister 7_______ (open) the door to meet her.

下列属于期货投机的原则的有（）。

A.充分了解期货合约

B.制订交易计划

C.确定赢利目标和亏损程度

D.确定投入的风险资本

Which of the following statements is NOT true

A．Aspirin can relieve pain.

B．Aspirin can reduce fever.

C．Aspirin can relieve inflammation.

D．Aspirin can reduce stomach lining.