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问题 多项选择题

资产负债表反映企业一定日期全部资产、负债和所有者权益的情况。当房地产开发经营公司开发或投资一个新的房地产项目时，通常需要编制该企业的资产负债表，以计算（）等反映企业财务状况和清偿能力的指标。

A.资产负债率

B.借款偿还期

C.投资回收期

D.流动比率

E.速动比率

答案

参考答案：A, D, E

问答题

在两个广口瓶中分别盛有纯酒精和纯水．请你用二种方法将它们区分开来（只要求说出区分的方法并明确说出结论，不用叙述具体的实验操作步骤）．

例：用量筒量出相同体积的纯酒精和纯水倒入质量相同的烧杯中，放到已调平衡的天平的两个托盘上．下沉的一端是纯水．

方法一：

方法二：
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单项选择题

Questions 81-90 are based on the following passage.


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 passage is primarily concerned with ______.

A. informing readers of different sea creatures
B. describing predatory microscopic organisms
C. solving some long-lasting mysteries about the sea
D. discussing the environment for various fishes
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