Seeing a large crowd at the street corner，I became aware of     unusual happening．

A．a(chǎn)nythingB．somethingC．everythingD．nothing

B

解析試題分析：考查不定代詞：A．a(chǎn)nything任何事，B．something某些事C．everything任何事D．nothing沒(méi)有事情，拐角，我意識(shí)到不尋常的事情發(fā)生了。選B。
考點(diǎn)：考查不定代詞
點(diǎn)評(píng)：不定代詞的考查看句式：something用于肯定句，anything用于否定句，nothing是完全否定，everything和not連用是部分否定。

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D．helped a lot with her research on leopard seals in Antarctica
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A．the size is becoming smaller
B．more instruments are involved to gather more data
C．they allow researchers to see where and how animals live
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B．The development of Crittercams in the past 20 years．

C．How crittercam was invented．

D．How crittercam works．

2. What inspired Marshall to invent crittercam?

A．The sight of sucker fish clinging to a shark on a dive．

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C．Noticing a shark eating a sucker fish on a dive．

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B．is the most powerful tool in studying animals

C．enabled her to observe the crows in the South Pacific closely

D．helped a lot with her research on leopard seals in Antarctica

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A．the size is becoming smaller

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