【正确答案】topic The lecture refers to two important adaptation abilities of alpine plants. example 1 The first one is low-growing characteristic. Most alpine plants have a height of less than 10 centimeters and this little height can help them defend wind and repetitive snow. Their deep root systems help them develop more available nutrients resources from the soil. example 2 The other characteristic is that they have a waxy coating, preventing moisture from evaporating and helping store water inside. conclusion In short, these plants cost little energy and can store water and nutrients from the soil.

【答案解析】[听力原文] W: Alpine plants can strongly adapt to the extreme climates found at high altitude. They often grow in barren soil or shattered rocks, under great changes in temperature from searing heat to extreme cold. They are often lashed by gales of forceful winds. However, these plants can still tenaciously grow, thanks to two important adaptation abilities. The low-growing feature of alpine plants has obvious advantages in defending wind resistance and repetitive snow falls. Most alpine plants have a height of no more than 10 centimeters and most of their biomass is concentrated in the roots, so these features can help prevent themselves from being destroyed by the wind. Water and available nutrients often lie far below the surface in mountain habitats. Plants with deep root systems are more capable to exploit available nutrients resources. Another important feature is that a waxy coating can be found on some plants' leaves and stems in deserts and the Alps. The wax prevents moisture from evaporating and helps store water inside. Thick, waxy succulent leaves are another adaptation to help prevent water loss. It's interesting that alpine plants have many characteristics same with those in the deserts. The plants growing in these different habitats have to cope with similar harsh conditions and find ways to prevent water loss.