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【简答题】
虚拟现实最本质的特征:________、 ________、 ________。 其中 是 ________ 虚拟现实最重要的特征。
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【简答题】Coupons should be thrown away because__________．
【简答题】A．kept B．pulled C．thrown
【单选题】Why is the rubbish still here? It ought to yesterday.()
A.
be thrown away
B.
have thrown away
C.
have been thrown away
D.
throw away
【单选题】Factories must clean their water ______.
A.
before it is thrown away
B.
when it is thrown away
C.
after it is thrown away
【单选题】The sunlight is white and blinding, ____ hard-edged shadows on the ground. A. throwing B. being thrown C. to throw D. to be thrown
A.
throwing
B.
being thrown
C.
to throw
D.
to be thrown
【单选题】Seven billion drink cans ____ in Britain each year.
A.
will be thrown away
B.
be thrown away
C.
are thrown away
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