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2. Put the following into Chinese 英译汉（1）go online（2）send short messages（3）microblog（4）make videos（5）check email（6）take photos
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4. Choose and fill 选择适当的单词填空（1）The man_________(who/what) you saw yesterday is a doctor from Beijing.（2）Here is a book_________(who/that) will give you a lot of useful information.（3）Everything_________( that/which) I told you just now is true.（4）The girl_________(who/which) sang well at the party last night is my friend.（5）The mobile phone_________(that/who) is made in China is mine.
在烟草整个生长发育期间，烟株对养分的吸收积累近似于“S”型曲线。
随着叶位上升，烟叶中累积的土壤氮的比例上升,而肥料氮的累积比例随之下降。
下部叶受土壤氮的影响最大，且随着生育期的延长，这种现象愈来愈明显
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