第一篇
Climate change has claimed its latest victim：Limacina helicina，a planktonic，predatory(捕食的)sea snail that’s a member of the taxonomic group
more(36)__________ known as sea butterflies．(The name is(37)__________ from the wing-like lobes(叶瓣)the tiny creatures use to get around．)In a study(38)__________ published in joumal Proceedings of the Royal Society B，a group of scientists from the National Oceanic and Atmospheric Administration (NOAA)and Oregon State University have fo und that the Pacific Ocean’s dec reasing pH—its acidifying(酸化)，in other words-is dissolving L．helicina’s thin shells．
The researchers collected sea butterfly(39)__________ from 13 sites along the Pacific coast(between Washington and southern California，going over each with a scanning electron microscope．More than half of the shells(53％)from onshore individuals(40)__________ signs of “severe dissolution damage，”while 24％of(41) __________ individuals suffered dissolution damage．The study’s(42)__________ investigator, Dr. Nina Bednarsek of NOAA，described the affected L．helicina shells as having a texture not unlike “cauliflower” or “sandpaper．”
According to the paper，there was a “strong positive(43)__________ ”between the proportion of sea butterflies with severe shell dissolution damage and “the percentage of undersaturated(未达到饱和的)water ”near the ocean’s surface．The researchers conclude “shell dissolution owing to(human．caused
ocean(44)_________has doubled in near shore habitats since pre．industrial conditions across this region and is on track to triple by 2050，”a
truly(45)__________ prediction．Moreover, the broader implications for ecosystem are unclear, as damaged shells make it harder for L．helicina to fight infections，stay buoyant，and protect themselves from predators．
A. showed
B. recently
C. protected
D. commonly
E. derived
F. samples
G. offshore
H. principal I. noticed
J. correlation K. encouraging? L. seaward
M. acidification N. grim
O. pollution
词性归类
答案解析
第二篇
The social network will let users“mute”messages from other users on their timelines without the muted person’s knowledge，thereby avoiding the(36)__________ process of having to unfollow(取消关注)，or put up with，your(37)__________talkative IRL friends．Twitter rolled out new(38)__________to let users better manage the deluge(泛滥)of tweets they receive．
Users can now“mute”people they follow, removing those people’s tweets and retweets from their own timelines．The muted person won’t know that he or she has been(39)__________．It’s a stealthy way to read less content from certain users without having to unfollow them．A person can easily be muted or(40)__________at any time，Twitter said in a blog post．
“Mute gives you even more(41)__________over the content you see on Twitter by letting you remove a user’s content from key parts of your Twitter experience，”the company said．
Though Twitter had been experimenting with the feature in recent weeks，it announced that muting will be(42)__________to all users of the company’s iOS and Android apps，as well as the Twitter．com website．Some other Twitter applications，like TweetDeck，already allowed muting．
The feature is part of Twitter’s(43)__________strategy to make its service more accessible to a wider range of people．Following a successful initial public offerin9，Twitter’s stock has tumbled in recent months as investors worry about the social network’s(44)__________to attract new users．CEO Dick Costolo(45)__________that Twitter would make changes to its interface this year to make it easier to understand and manage．The company overhauled(彻底检修)user
