题目内容

A．typesB．categoriesC．speciesD．classes

A. types
B. categories
C. species
D. classes

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A．linkB．exchangeC．networkD．site

A. link
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C. network
D. site

A．suppliesB．offersC．presentsD．provides

A. supplies
B. offers
C. presents
D. provides

A．sinceB．becauseC．asD．while

A. since
B. because
C. as
D. while

A．howeverB．furthermoreC．otherwiseD．instead

A. however
B. furthermore
C. otherwise
D. instead