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  3. Citizen Scientists Understanding how nature responds to climate change will require monitoring key life cycle events—floweri

Citizen Scientists Understanding how nature responds to climate change will require monitoring key life cycle events—floweri

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问题                             Citizen Scientists
    Understanding how nature responds to climate change will require monitoring key life cycle events—flowering, the appearance of leaves, the first frog calls of the spring—all around the world. But ecologists can’t be【C1】______so they are turning to non-scientists, sometimes called citizen scientists, for help.
    Climate scientists are not present everywhere.【C2】______there are so many places in the world and not enough scientists to observe all of them, they are asking for your help in【C3】______signs of climate change across the world. The citizen scientist movement encourages【C4】______people to observe a very specific research interest—birds, trees, flowers budding, etc.—and send their observations 【C5】______a giant database to be observed by professional scientists. This helps a small number of scientists track a【C6】______amount of data that they would never be able to gather on their own. 【C7】______like citizen journalists helping large publications cover a hyper-local beat, citizen scientists are ready for the conditions where they live.【C8】______that’ s needed to become one is a few minutes each day or each week to gather data and【C9】______it in.
    A group of scientists and educators launched an organization last year【C10】______the National Phenology (生物气候学) Network. "Phenology" is what scientists call the study of the timing of events in nature.
    One of the group’ s first efforts relies on scientists and non-scientists【C11】______to collect data about plant flowering and leafing every year. The program, called Project BudBurst, collects life cycle【C12】______on a variety of common plants from across the United States. People participating in the project—which is【C13】______to everyone—record their observations on the Project BudBurst website.
    "People don’t【C14】______to be plant experts—they just have to look around and see what’ s in their neighborhood, " says Jennifer Scheartz, an education consultant with the project. " As we collect this data, we’ll be able to make an estimate of【C15】______plants and communities of plants and animals will respond as the climate changes. "
【C15】
选项 A、who
B、how
C、before
D、since
答案B
解析 这句话的大意是：通过搜集数据，我们就能估算出植物和生物群落对气候变化会做出怎样的反应。how表示对方式的提问，用在此处符合题意。who谁，用来提问或连接先行词为人的定语从句；before在……之前；since自从，常用来引导时间状语从句，从句常用过去时，主句常用现在完成时。
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