学习化学可以学会判断，避免走入生活和学习的许多误区．如：纯碱不是碱，它是盐；铅笔

多效蒸发系统水运首先应该（）。

A、从循环水槽向再吸收塔加水

B、启动汽提塔釜液泵

C、引入蒸汽

D、投用真空泵

我国高铁的快速发展提高了旅游的速度与效率，改变了“旅长游短”的苦恼，使“快旅慢游”成为现实。这表明（   ）

A．生产是消费的最终目的

B．消费方式调节生产方式的转变

C．生产对消费起决定作用

D．新的消费热点会带动相关产业的发展

根据《证券投资基金法》的规定，设立基金管理公司，应当具备一定条件，并经国务院证券监督管理机构批准，该条件包括( )。

A．注册资本不低于1亿元人民币，且必须为实缴货币资本

B．取得基金从业资格的人员达到法定人数

C．有完善的内部稽核监控制度和风险控制制度

D．主要股东具有从事证券经营、证券投资咨询、信托资产管理或者其他金融资产管理的较好的经营业绩和良好的社会信誉，最近3年没有违法记录，注册资本不低于2亿元人民币

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.

The word "prompted" underlined in Paragraph 3 means ______.

A. stimulated
B. attracted
C. annoyed

D. shocked

探测气的安装位置，应考虑离送风口的距离，离墙壁、梁的距离及（）。

A.1000mm之内不应有遮挡物

B.500mm之内不应有遮挡物

C.离水管的距离

D.离回风口的距离