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【简答题】
已知命题p ：方程 的两个根都为实数；命题q：方程 的两个根不相等．写出命题“p或q”、命题“p且q”、命题“非p”形式的命题，并指出其真假．
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举一反三
【单选题】In the reading room, we found her ________ at a desk, with her attention ________ on a book.
A.
seating; fixing
B.
seated; fixed
C.
sitting; fixing
D.
to sit; fixed
【简答题】Please remain __________ until the plane has come to a complete stop. A．to seat B．to be seated C．seating D．seated
【单选题】I found many people ________ on the benches at the end of the day，chatting.
A.
sitted
B.
sitting
C.
seating
D.
seat
【单选题】The teacher was surprised to see lots of people_____at the back of the room _____ worried. [ ]
A.
seating;looked
B.
seated;looking
C.
sitting;looked
D.
sat;looked
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