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【简答题】
上面图形中,是直角的有: 是锐角的有: 是钝角的有:
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皮皮学刷刷变学霸
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【单选题】Lucy was having a holiday with her friend in a national park ____ she was bitten on the foot by a snake.
A.
while
B.
since
C.
once
D.
when
【简答题】计算机系统的3个层次结构由内到外分别是硬件系统、系统软件和_______。
【单选题】Independence Day is _______ national holiday in the States --- all government employees get _______ day off.
A.
the; the
B.
a; /
C.
a; the
D.
/; the
【单选题】During _____ National Day holiday, I received _____ endless messages from interested partners but none were suitable. [ ]
A.
the; the
B.
the; an
C.
/; the
D.
the; /
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