题目内容

8．…Will you go to the meeting for their discussion？
…No，______ invited．I don't feel like getting involved in their business．（　　）
A．unlessB．untilC．even ifD．otherwise

分析 ---你会去开会和他们进行讨论吗？
---不，即使被邀请．我不喜欢参与他们的事．

解答 答案：C．根据I don't feel like getting involved in their business可知我不喜欢参与他们的事，因此前句表示即使被邀请，两句之间是让步关系，所以答案是C even if"即使"．其他选项的含义分别是A"除非"；B"直到"；D"否则"．

点评 考查从属连词．
even if一般引导的是把握不大或假设的事情，
even though引出的是事实．
如：Even if we achieve great success in our work，we should not be proud．
即使我们在工作中取得了巨大成绩，也不应该自满．
Even though he was late，he was not criticized by the teacher．
虽然他晚了，可他并没有受到老师的批评．

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     The team then studied the differences in the two groups'songs in the laboratory．To encourage them to sing they exposed the males to a female grasshopper，and then recorded their courtship songs．Analysis of almost 1，000 recordings revealed grasshoppers living beside noisy roads produced different songs to those living in quieter locations．
     According to Lampe："Bow-winged grasshoppers produce songs that include low and high frequency components．We found that grasshoppers from noisy habitats increase the volume of the lower-frequency part of their song，which makes sense since road noise can mask signals in this part of the frequency spectrum（频谱）．"
     The team's findings are important because traffic noise could be upsetting the grasshopper's mating system（交配系统）．"Increased noise levels could affect grasshopper courtship in several ways．It could prevent females from hearing male courtship songs properly，prevent females from recognising males of their own species，or impair females'ability to estimate how attractive a male is from his song，"Lampe explains．
     Having discovered that human-made noise affects insect communication，the researchers now want to learn more about how the mechanism works，and whether the grasshoppers adapt to noise during their development as larvae（幼虫），or whether males from noisy habitats produce different songs due to genetic differences．
     The bow-winged grasshopper is a common species in Central Europe．Adults occur mainly between July and September，preferring dry grasslands．Around 1.5 cm long，they vary in colour from green and browns to red and purple．The male's song consists of 2 second-long phrases that increase in amplitude （振幅） towards the end．The beginning of a phrase is characterised by slower ticking sounds that increase in speed and amplitude，leading to a buzzing sound towards the end of the phrase．A courtship song usually includes 2 phrases．
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B．raise the awareness of protecting bow-winged grasshoppers．
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