单项选择题

A．With a knife.
B．On the edge of some metal.
C．On some glass.
D．On a piece of paper.
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单项选择题
A．It’s amazing that anyone could move so fast.B．Televisions mark the beginning of modem life.C．Modern life is changing very fast.D．It’s hard to remember the past.
A．It’s amazing that anyone could move so fast.
B．Televisions mark the beginning of modem life.
C．Modern life is changing very fast.
D．It’s hard to remember the past.
单项选择题
Why is the close planting of trees of the same species avoided in modern orchards and forests
A．Because mixed forests and orchards are the recognized procedures these days.
B．Because trees of same species may cause the spread of disease.
C．Because modern orchards and forests are more specialized.
D．Because trees planted crowdedly do not have enough room to develop their roots.
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