问题 单项选择题

蜜蜂是过群体生活的。在一个蜂群中有三种蜂:一只蜂王,少数雄蜂和几千到几万只工蜂。

蜂王的身体最大,几乎丧失了飞行能力。不过这没有关系,它有千千万万个儿女,它们可以供养它。在蜜蜂的家族中,只有蜂王可以产卵,它一昼夜能为蜂群生下1.5到2万个兄弟。蜂王的寿命大约是三年到五年,在蜜蜂的家庭中它算得上是寿星了。

雄蜂和普通的蜜蜂大不相同,它“人高马大”,身体粗壮,翅也长。它的责任就是和蜂王交尾。交尾之后,它也就一命呜呼了。

工蜂在蜜蜂家族中数量最多、职责最大,它们是蜂群的主要成员,工作也最忙:采集花粉、花蜜,配制它们的“口粮”,哺育它们的弟弟们,喂养它们的母亲,修造它们的房子,保护家园,调节室内温度和湿度……别看这样,它们的身体是非常弱小的,寿命也只有6个月,就像天空的流星一样,仅有一点儿时间去闪耀自己的光辉。

蜜蜂是自然界里最勤劳的昆虫。开花时节,它们忙得忘记早晚,有时还趁着月色采花酿蜜。要酿一公斤蜜,必须在100万朵花上采集原料。虽然它们采蜜难,但每年一窝蜂都能割几十斤蜜。如果动物世界也有组织的话,那么蜜蜂一定能获得“最热爱劳动奖章”。

在一个蜂群中,其主要成员是:()

A.蜂王

B.工蜂

C.雄蜂

D.雌蜂

答案

参考答案:B

单项选择题 A1/A2型题
单项选择题

It sounds like a science fiction, but researchers say it’s a scientific fact: Microscopic organisms dubbed "killer algae" are paralyzing fish with unknown toxins and then eating away at their flesh. They might be making people sick, too.
The name given to this single-cell organism, or dinoflagellate, is Pfiesteria piscimorte—literally, "fish killer." It was discovered at North Carolina State University in 1988, but at the same time, few scientists believed in its existence, much less in its highly unusual predatory nature. But ongoing research has led to international acknowledgment of the phenomenon and, recently, research funding.
Seemingly prompted by an unknown substance secreted by fish, the aggressive creature swims into action. It sends neurotoxins into the water and air, paralyzing a fish’s nervous system, and causing it to gasp for air at the surface. Eventually the fish suffocates. The killer dinoflagellate then attaches itself to the fish and begins sucking away at its flesh. This macabre scenario may help solve several sea mysteries, such as why fishermen report seeing "fish walks" (fish trying to leave the water) and pools of dead fish with holes eaten through them.
Whether humans are affected by the dinoflagellate’s toxin remains to be seen. Researchers think it’s unlikely eating fresh fish are in danger, but anyone with frequent exposure to the creature could be in peril. Several researchers working with the algae have reported bouts of memory loss and disorientation.
To understand the killer algae further, scientists must fully characterize their toxin and determine what stimulates them to attack. They also need to know if the algae are hurting fish populations, and whether pollutants make them more likely to attack.

Which of the following questions is answered according to the information given in the passage

A.What is the toxin used by the fish killer

B.Who first discovered the organism

C.How does the fish killer paralyze fish

D.How many fishes can the organism kill each day