单项选择题


A．In a word
B．In a sense
C．Indeed
D．In other words
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单项选择题
A．asB．just asC．likeD．unlike
A．as
B．just as
C．like
D．unlike
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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