单项选择
—When ________ personal computers ________?
— In 1971.
A.was; discovered B.were; invented
C.were; discovered D.was; invented
B
Teaspoons are used______ things.
A.for serve B.to serving
C.to serve D.serving
C
This kind of drink ______ a ______ smell. Many children like to drink it.
A.produces; pleasant B.is made; pleasure
C.was refused; glad D.protects; pleasant
A
—How was tea invented?
—______
A.5,000 years ago. B.By accident.
C.Shen Nong,a ruler. D.Over an open fire.
B
—Could you please sweep the floor? I'm going to cook dinner.
—______.I'll do it at once, Mum.
A.I'm afraid not B.You're kidding
C.It's a shame D.With pleasure
D
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