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【单选题】
到( )时期,火药被开始引入军事、战争。A.
春秋战国
B.
C.
D.
元代
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举一反三
【单选题】The art club is for members only. You can’t go in ____ you are a member.
A.
unless
B.
because
C.
if
D.
though
【单选题】The club is for students who care about keeping our air and water clean, our wildlife protected, and our planet safe for us and future generations. What kind of club is described above?
A.
Art Club.
B.
Environmental Club.
C.
Book club.
D.
Film club.
【简答题】什么叫变频器?变频器有哪些应用?
【单选题】The art club is for members only. You can’t go in _____ you are a member.
A.
if
B.
unless
C.
though
D.
\
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