量值溯源

绝对危险性的表示形式是（）

A.众数

B.比值比

C.百分数

D.健康分值

E.健康危险度

妇人行经腹痛常见的病因病机有

A.气滞血瘀

B.寒凝胞脉

C.气血亏虚

D.热入血脉

E.痰浊阻络

会计软件应当具有在计算机发生故障或者由于强行关机及其他原因引起内存和外存会计数据被破坏的情况下，利用现有数据恢复到最近状态的功能。 ( )

Lichens may grow on the bark of a tree in a steaming tropical rain forest, on the bricks of big city buildings, on rocks in hot springs, on wind-swept mountaintops, and in the driest desserts. In the arctic, they provide the principal food for caribou, and they are one of the few plants that grow in Antarctica. They are pioneers, appearing in barren rocky areas and starting the formation of soil in which mosses, then ferns, and then other plants can take root.
Lichens are a partnership of two plants — fungi and algae. The lichen body is made up of a network of fungal strands. In the upper layers of these grow groups of algae. The two organisms live together to the benefit of both, a relationship known as symbiosis. The fungi provide support, absorb water, and shelter the tender algae from direct sunlight. The algae carry on photosynthesis and provide the fungi with food. The algae can live independently and are recognizable as a species that grows alone. The fungi, on the other hand, cannot live apart from their partners. They can be placed in known classes of fungi but are unlike any species that lives independently.
So definite are the form, color, and characteristics of these double organisms that for hundreds of years, they were classified as one. More than 15,000 "species" were named. If these organisms are classified as separate species, it is difficult to fit them into the existing system of classification. But if they are classified separately, these species of fungi seem rather strange. Lichens are a splendid example of the difficulties faced by taxonomists in classifying species.

Which of the following can be inferred about the effect of direct sunlight on lichens

A．It damages the algae.
B．It helps the fungi absorb water.
C．It is required for the algae to carry on photosynthesis.
D．It destroys the fungi.

运输部门认为把车船票价提高40%的方案必须执行。并对此做出解释：不可否认，这些费用的增加会加重公共汽车和地铁乘客的负担；但是，如果不加价，服务质量就会大幅度下降，其结果会丧失大量的乘客，而这是不能令人接受的。
以下哪项指出了上述论证所使用的论证策略？（）

A.它为方案的执行不会导致不利的后果提供了证据。

B.它表明无论选择哪种主张都会陷入矛盾的困境。

C.它通过为拒绝接受另一种选择提供理由而间接地得出了结论。

D.它通过说明为什么坚持执行的方案不会遭到另一种方案的反对来为所坚持的方案辩护。

E.它通过以往被证明了的同样做法所取得的效果来为现在所坚持的方案辩护。