York, _____ last year, is a nice old city. [ ]A. that I visitedB. which I visited C. where I visited

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• 根的长度能不断增加的原因是（）A．根冠不断增加新的细胞，分生区也不断增加新细胞B．根冠不断增加新的细胞，伸长区不断伸长C．分生区不断增加新细胞，伸长区不断伸长D．伸长区不断-生物
• 某同学在10岁时按自己身高在5米高的树上刻了离地面1.4米的一个标记，10年后，他的身高为1.8米，这棵树长到20米，那么原来刻的记号，现在离地面的距离是（）A．6.4米B．1.4米-生物
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• 关于导管和筛管的描述中，错误的是（）A．茎的木质部中有导管B．茎的韧皮部中有筛管C．筛管能运输有机物D．导管能向下运输水分和无机盐-生物
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