搜题请搜索小程序“爱下问搜题”
问题 多项选择题

关于五输穴的理论，正确的是 （）

A.病在脏者取之井

B.病时间时甚者取之荣

C.病变于色者取之输

D.病变于青春取之井

E.病在胃，取之合

答案

参考答案：A, E

解答题

在城市有些家庭把一种生态球作为家庭摆设，见下图：该球密封，内装有水，还生活有甲、乙、丙三条小鱼；底部有沙子，并生活着一些水藻．把生态球放在有阳光的地方．球中的水藻通过光合作用为小鱼提供氧气和养料，小鱼的呼吸作用为水藻的光合作用提供二氧化碳，它的排泄物为水藻的生长提供肥料，所以小球中的生物能生活很长时间．

（1）影响小鱼甲生活的环境因素有______；其中属于非生物因素的是______，属于生物因素的是______．

（2）生态球中，生物适应环境的例子有哪些？______，生物影响环境的例子有哪些？______．

（3）如果把这个生态球放在黑暗中，里面的生物还能存活吗？______，试分析一下原因：______．
查看答案
单项选择题

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 best expresses the main idea of Paragraph 2

A．Because of their characteristics as double organisms, it is difficult to classify lichens.

B．Over 15,000 varieties of lichens have been identified.

C．Double organisms should always be classified as separate species.

D．Taxonomists always find it difficult to classify new species of plants.
查看答案