manhattan一道阅读求解

柿子酱MistyUID：3516338

全文在下面 这道题用到的句子高亮了。

Epiphytes (more commonly known as air plants) are plants that grow on other plants in a non-parasitic manner, and derive their moisture and nutrients from their surroundings, rather than through a root structure. These plants use photosynthesis for energy and, when non-aquatic, absorb moisture from the air. Epiphytes are defined by their non-parasitic relationship with their hosts, on which they depend for physical support rather than nutrients. That is not to say that epiphytes don't ever damage their host, only that any damage they cause occurs indirectly. Parasitic and semiparasitic plants that grow on other plants are often referred to as "epiphytic," in spite of their not being true epiphytes.
          Mistletoe is one such semiparasitic plant. Mistletoe grows on other plants, and while it does some of its own photosynthesis, it depends on its host for water and mineral nutrients. Other epiphytic plants, such as a particular species of Griselinia, send long roots down towards the soil while perched in the high branches of a tree. These plants are known as hemiepiphytes, meaning that they start their lives as true epiphytes, but then become normal rooted plants. Some hemiepiphytes send so many roots downwards that they eventually encircle their host tree, killing it either through girdling--the removal of bark resulting in the death of woody tissue--or through competition for light.



问题

The author would agree with which of the following statements?
√ Hemiepiphytes are not true epiphytes for the entirety of their lifecycles
×Epiphytes derive their required moisture from the air
×Epiphytes are differentiated from epiphytic plants by the fact that they don't cause any damage to their hosts


如果选第一项 第一项的not应该是对for the entirety of their lifecycles

但这里为什么不把not的否定理解成对true H的否定呢？

岳然UID：3654715

确实有歧义……只能说题目没出好。

柿子酱MistyUID：3516338

岳然 发表于 2015-10-2 16:45
确实有歧义……只能说题目没出好。

谢谢~这样的话我就放心啦