a risk of doing/sth

E： 无论第一个it 是形式主语还是代表ozone都不对 - appear 是系动词后加表语，所以不用再加it

Some service industry companies, in fact, regard these traditional routes to global expansion as inappropriate for service industries because of their special need to preserve local responsiveness through local presence and expertise

A survivor of the changes that swept the travel industry as a result of the deregulation of the airlines in 1978 — changes that included dramatic growth in the corporate demand for travel services, as well as extensive restructuring and consolidation within the travel industry

with。 prep 用 因为，介词 with+n。

a后半句不对
which more than doubled

mark

fund-raisers成功得从80%联系过的人里面拿到捐助，然而好的fr会试图去联系不太可能捐钱的人，所以这么高的成功率说明这些fr并不努力。问support
choice a, S大学的fr联系那些从没捐过钱的人的频率和其他大学fr联系没捐过钱的人的频率一样高. correct

RON："to have ___ed" is the only past-tense version of "to ___".
to HAVE done 表达的是to do 的过去形式的含义

原文信息： Telomera is produced---> cells are actively dividing
choice b, 原文的否命题 Telomera is not produced(no Telomera) ---> cells are not actively dividing。否命题不一定是一定可以成立

T是一种只存在于不断分裂的细胞中的酶，所以T一般不会出现在成年人体内。但是BM和cancer细胞都是特例，因为它们都在人体内不停的分裂。问must be true
choice c, 骨髓细胞中出现Telomerase 并不表明已患上骨髓癌. correct,因为出现在骨髓细胞中的Telomerase有两个可能的来源：1. 癌细胞分裂 2.骨髓细胞本身分裂

原句中whether biological life forms ever emerged on Mars作为定语修饰question，and后面连接了另一个question的定语，应该用whether而不是if
根据语意，应该是这些traces是否依然存在着，而不是依然有能力存在着。因此can是赘余的

c其实是无关的选项

又错了，mark
c中Parasitic wasps learn from experience 是不是从经验来学习，文中没说
d中怎样会导致幼虫死的更快，文中更没有说，也无从推论
推论题必须保证一定正确。
The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behavior.

choice e,割裂了found 和from the second most massive dinosaur的关系，定语从句from the second most dinosaur就变成了fossil bones本身固有的属性

but availability of uncultivated land reduced the incentive to employ the productivity-enhancing tech nologies

mark

Researchers also measured land-tenure security: in Tawahka society, kinship ties are a more important indicator of this than are legal property rights, so researchers measured it by a household's duration of residence in its village.
假设就是land security-> kinship-> duration

原文信息是use of chemical herbicides

But these studies have focused on villages with limited land that are tied to a market economy rather than on the relatively isolated, self-sufficient communities with ample land characteristic of rain-forest regions