There is a web-known proverb，“Every horse thinks its OWn pack heaviest，”which means whether people feel optimistic or not (1)lies in what attitudes they (2)adopt．(3)It is universally acknowledged that life is (4)by no means perfect and a positive attitude makes life brighter．(5)As the case stands，it is our attitude rather than the situation itself that determines how we feel． (6)On the one hand，a positive mind brings about an active life， because to be in a good mood or a bad mood is(7)at one’s own choice．(6)On the other hand，looking at the bright side of the situation and remaining cheerful work out quite well when one is confronted with(8)adversity． In such a(9)rat-race society，everyone (10)is bound to encounter difficulties．In my opinion，we should keep an optimistic attitude to (11)pull through any hardship，as we can say“attitude is everything’”．
Analysis
(1) lie in“取决于” (2) adopt“采取” (3) It is universally acknowledged that“众所周知” (4) by no means“绝不” (5) as the case stands“事实上” (6) on the one hand…on the other hand…这一系列表达让文章看起来更有条理，思路更清晰。 (7) at one’s own choice“任意选择” (8) adversity“逆境” (9) rat-race“充满竞争的” (10) be bound to“必定” (11) pull through“渡过(难关)”
参考答案:to avoid physical discomfort and promote the psychological well-being of animals 答案解析:[分析] Not only must researchers strive to avoid physical discomfort, but they are also required to p
