题目内容
3.16.What does Mr.Black do?A.He is a cook.
B.He is a scientist.
C.He is a teacher.
17.How does Mr.Black usually go to work?
A.By car.
B.On foot.
C.By bus.
18.How many inventions has Mr.Black made so far?
A.Fourteen.
B.Twenty-four.
C.Forty.
19.What was Mr.Black's first invention used for?
A.Washing clothes.
B.Cutting grass.
C.Planting rice.
20.When was Mr.Black's most important invention finally made?
A.In 1989.
B.In 1991.
C.In 1996.
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