考察
前：between 必须加and，而不是to，from to也可以，排除c
后：与未画线部分联系，应该是as much as。去掉ade；；再有，未画线前面部分有个their feeding，也可以推测出画线部分应该是复数主语，即sperm whales，不要看到“a ton of squid a day”就以为是a sperm whale。一定要结合前后文未画线部分
考察：
前：Scientists believe that X--- that Y. X and Y are parallel clauses. ---- OG 破折号后可以加that也可以不加
中后：reduce their number优于被动语态
关键：！！！与未画线部分联系！！！最后and平行，and thus+n，那前面也是n，排除cde，而a中reducing 的逻辑主语变成了 ancestors，错误
考察：
句意
前：advocating为reformers的后置定语，现在分词形式表主动，ing定语表主动。advocate提倡，拥护
后：拥护的是一种方法，to reform prisoners， as the means to
e中advocate用了倒装但是引起了句意混淆，advocate的东西应该紧随其后，与c对比，排除
Zoologists had assumed that females of all phocid species, by contrast, use a fasting strategy in which mother phocids, having accumulated large energy stores before they arrive at breeding sites, fast throughout the entire lactation period, which lasts from 4 to 50 days depending on the species.
Until recently, zoologists believed that all species of phocids (true seals), a pinniped family, use a different maternalstrategy than do otariids (fur seals and sea lions), another pinniped family.
if也可以引导非虚拟，如果if从句加的是动词原型，表明作者觉得这个if是很可能发生的，所以后面也就不需要用虚拟语气了，只是假设一种可能出现的现象
eg： A wildlife expert predicts that the reintroduction will fail if the density of the timber wolf population in that region is greater than one wolf for every 39 square miles.
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1+9
2+8
3+7
4+6
0
5
要取7个才能确保有两张纸的数字和为10，因为6个的极端情况（012345或056789）