11．A.doubtfully

　　B．impatiently

　　C．attentively

　　D．excitedly

　　12．A.silently

　　B．properly

　　C．violently

　　D．gently

　　13．A.innocence

　　B．curiosity

　　C．surprise

　　D．happiness

　　14．A.possibly

　　B．occasionally

　　C．rarely

　　D．just

　　15．A.welled

　　B．shone

　　C．closed

　　D．burned

　　16．A.quick

　　B．different

　　C．tiny

　　D．strong

　　17．A.realized

　　B．concluded

　　C．understood

　　D．reflected

　　18．A.where

　　B．what

　　C．which

　　D．why

　　19．A.gradually

　　B．finally

　　C．generally

　　D．suddenly

　　20．A.When

　　B．Because

　　C．Although

　　D．Since

　　.阅读理解

　　(2016·河北省普通高中质量检测)

　　In an ideal world，people would not test medicines on animals.Such experiments are stressful and sometimes painful for animals，and expensive and time­consuming for people.Yet animal experimentation is still needed to help bridge vast gaps in medical knowledge.That is why there are some 50 to 100 million animals used in research around the world each year.

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