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问题 单项选择题

被保人患某一种重大疾病时按重大疾病保险金总额的一定比例给给付，但其死亡保障不变。这种重大疾病保险称之为______。

A．提前给付型 B．独立主险型
C．按比例给付 D．回购式选择型

答案

参考答案：C

选择题

列河流无结冰期的是[ ]

A．黑龙江    

B．辽河    

C．黄河    

D．长江
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单项选择题

Some species of dolphins find their prey by echolocation; they emit clicking sounds and listen for echoes returning from distant objects in the water. Marine biologists have speculated that those same clicking sounds might have a second function: particularly loud clicks might be used by the dolphins to stun their prey at close range through sensory overload.
Which of the following, if discovered to be true, would cast the most serious doubt on the correctness of the speculation described above

A．Dolphins that use echolocation to locate distant prey also emit frequent clicks at intermediate distances as they close in on their prey.

B．The usefulness of echolocation as a means of locating prey depends on the clicking sounds being of a type that the prey is incapable of perceiving, regardless of volume.

C．If dolphins stun their prey, the effect is bound to be so temporary that stunning from far away, even if possible, would be ineffective.

D．Echolocation appears to give dolphins that use it information about the richness of a source of food as well as about its direction.

E．(E) The more distant a dolphin’s prey, the louder the echolocation clicks must be if they are to reveal the prey’s presence to the hunting dolphin.
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