18.If you want to be a citizen scientist,the National Science Foundation(NSF) has got you covered.NSF supports citizen scientists across all areas of science,whether your passion(热情)is scanning the night sky,exploring your own backyard or playing video games.
Join a Flock of Birders
eBird is an online platform that allows bird-watchers to record their sightings on a massive online database.With more than 100,000 active users,eBird involves bird population,distribution(分布)and habitat that users can explore in real time.In May 2015,there were 9.5 million records uploaded.
Count Every Drop
The Community Collaborative Rain and Snow Network is the largest provider of daily rainfall observations in the United States.Volunteers set up rain instruments and record data every time a rain,or snow storm passes.Data is organized and shared on the CoCoRaHS website,and used by the National Weather Service,scientists,farmers and so on.
Join the Plankton Party
Without plankton(浮游生物),life in the ocean would not exist.These tiny things form the base of the food chain and play an important role in the global carbon cycle.Plankton Party encourages citizen scientists to identify images snapped(拍照)by the ISIIS,an underwater robot.Classifying the images helps researchers understand plankton diversity,habitat and behavior.

21.What can bird-watchers do with eBird?C
A.Watch birds through satellites.
B.Choose their favorite birds.
C.Upload their sightings to a database.
D.Observe the night sky
22.Which subject can you learn about if you join Count Every Drop?D
A.Farming.
B.Biology.
C.Animals.
D.Weather.
23.What's the intention of the Plankton Party?A
A.To help researchers to learn about plankton.
B.To raise citizens'interest in plankton.
C.To inform citizens of how ocean life survives.
D.To tell us what ISIIS does with ocean life.
17.Alibaba started taking the lead in China by connecting big Chinese manufacturers (制造商) with big buyers across the world.Its business-to-business site,Alibaba.com allowed business to buy almost everything,Alibaba's advantage wasn't hard to judge:size.Alibaba is just big,even by Chinese standards.Its market attracts 231 million active buyers.8million sellers,11.3 billion orders a year-and Alibaba is just the middleman.It encourages people to use its markets-not charging small sellers a percentage of the sale.
If you warn a quick look into the influence of Alibaba on daily Chinese life,lake my experience.I moved to Beijing u year ago and quickly got tired of visiting small stores across the crowded,polluted city of 20million people in search of new electronics,bathroom furnishings,and anything else my wife wanted."You're looking for what exactly?Why not cry it?"my Chinese teacher asked me one day.With that,my wonderful new relationship with Alibaba began.
Alibaba's original business-to-business model now is second to consumer buying.Chinese retail (零售) buying makes up 80% of Alibaba's profit,and leading that group is Taobao,with 800 million items for sale and the most unbelievable selection of things you'll ever find.TMall.com is Alibaba's other big site,where you can find brand name goods from Nike and Unilever near the lowest prices.
What I have a hard time explaining to friends and family back in the U.S.is how China has gone beyond traditional shopping-big-box retailers especially-in favor of online purchases on Taobao and a few other sites.In smaller towns than Beijing,where big retailers have not yet traveled,shopping online is shopping,and shopping is Taobao.
I have a list of some of my recent purchases on Taobao for a sense of how wide the marketplace is.Almost everything arrived a day or two after ordering with free shipping.I'm not even a big buyer,because I need friends to help me search the Chinese-language site.When I was searching my purchase history on my Chinese teacher's iPad,which helps me buy goods,I looked through with great difficulty about 10of her purchases tor every one of mine.

28.Alibaba's advantage mainly lies inB.
A.its low price
B.its big size
C.its not charging small sellers
D.its business-to-business service
29.We know from the passage that AlibabaC.
A.will continue to develop.
B.charges all the sellers on its site a percentage of the sale.
C.acts as a bridge between the buyers and sellers
D.is of middle size among all the online sites.
30.What can be inferred from the passage?D
A.Alibaba's business-to-business service earns more money than retail.
B.TMall.com provides more profit than Taobao.
C.Taobao has no envious advantage over other similar online sites.
D.The author's Chinese teacher is also an online purchase lover.
31.What is the passage mainly about?D
A.Shopping online in China is TaoBao
B.How the author purchases online in China.
C.Shopping online goes beyond traditional shopping.
D.Alibaba influences people's daily purchase in China.
10.The following are several summer programs for children.
Duke University ADHD Program
Academic Summer Program is used to help 6th to 8th graders with ADHD(注意力缺乏多动症).The program uses techniques to teach study strategies,academic support skills,and cooperative learning activities.
Phone:919-416-2096
Location:Durham,North Carolina
Eagle Hill School(Connecticut)
The Summer Academic Day Program at Eagle Hill School is designed for children experiencing academic difficulty.Open to boys and girls ages 6to 12.The summer program immerses(使沉浸)kids in a total language environment specifically tailored to meet his or her needs.
Phone:203-622-9240
Location:Greenwich,Connecticut
The Gow School
The Gow School offers a traditional summer school program experience for boys and girls ages 8to 15.The 5-week session offers a specially designed curriculum for students who have experienced academic difficulty or have language based learning disabilities.Summer Program learners can be day students or live on campus(校园).
Phone:716-652-3450
Location:South Wales,New York
The Kentwood Summer Camp Program
The Kentwood Summer Camp Program is a school program catering toward children,teens,and their families who are not being successful in the traditional school environments socially,and or at home.It is for children and teens in grades K(Kindergarten) to 12.
Phone:954-581-8222or 954-634-0601
Location:Davie,Florida

21.Which number may parents of children with ADHD call?B
A.954-634-0601                   B.919-416-2096
C.716-652-3450                   D.203-622-9240
22.What is special about the Gow School Summer Program?C
A.It is for successful students
B.Learners are limited to boys
C.It allows students to live there
D.Learners are interested in language
23.Which program should a less sociable child attend?D
A.Duke University ADHD Program
B.The Gow School Summer Program
C.The Summer Academic Day Program
D.The Kentwood Summer Camp Program.
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