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  3. It has been a hundred years since the last big one in California, the 1906 San Francisco earth quake, which helped give (1)_____

It has been a hundred years since the last big one in California, the 1906 San Francisco earth quake, which helped give (1)_____

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问题     It has been a hundred years since the last big one in California, the 1906 San Francisco earth quake, which helped give (1)_____ to modem earthquake science. A century later, we have a highly successful (2)_____, called plate tectonics, that explains why 1906-type earthquakes happen—along with why continents drift, mountains rise, and volcanoes (3)_____ the Pacific Rim. Plate tectonics may be one of the (4)_____ triumphs of the human mind, geology’s (5)_____ to biology’s theory of evolution. And yet scientists still can’t say when an earthquake will happen. They can’t even come (6)_____.
    What scientists can do right now is make good maps of fault zones and (7)_____ out which ones are probably due (8)_____ a rupture. And they can make forecasts. A forecast might say that, over a certain number of years, there is a certain (9)_____ of a certain magnitude earthquake in a (10)_____ spot. And that you should fix your house to its foundation and glue the water heater to the wall.
    Turning forecasts into predictions—"a magnitude 7 earthquake is (11)_____ here three days from now"—may be impossible, but scientists are doing everything they can to solve the (12)_____ of earth quakes. They break rocks in laboratories, studying how stone (13)_____ under stress. They hike (14)_____ ghost forests where dead trees (15)_____ of long-ago tsunamis. They make maps of unsecured, balanced rocks to see where the ground has (16)_____ in the past and how hard. They dig ditches across faults, searching for the active trace. They have wired up fault zones with so many sensors it is (17)_____ the Earth is a patient (18)_____ intensive care.
    (19)_____, we tell ourselves—trying hard to be persuasive—there must be some way to (20)_____ order and criterion on all that untrustworthy ground.

选项 A、Surely
B、Instead
C、However
D、Additionally
答案A
解析 语义衔接题。本段是文章的结尾段，对前文做综述，再次强调虽然目前人类无法对地震做出准确的预测，但是不久的将来一定可以掌握更多的相关知识，因此本句句首应填surely"的确地"，表示对前文的强调。Instead"代替"；However"无论如何，可是"；Additionally"加之，又"。这几个词虽然均为副词，但词义不符。
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