of local and changing conditions.

　　A new means of transport for auxin

　　The transport of auxin through the plant plays a vital role.And，from all appearances，it is not a simple matter.The researchers identified an important new link and means of transport for auxin: PILS proteins (蛋白质)．PILS proteins are vital for auxin­dependent plant growth and adjust the intracellular(细胞内的)storage of the hormone.It is exactly this compartmentalizing (分类) of auxin that seems functionally important for the various developmental processes.

　　Growing crops more efficiently: the right amount of auxin in the right place

　　Higher auxin levels at the right moment and in the right place result in better growth and greater harvest.Better adjustment of auxin levels would make plants grow more efficiently.The researchers hope to contribute to the development of more efficient growing processes by continuing to sort out auxin transport processes.

　　【语篇解读】　本文讲述了现代研究条件下对于植物生长素(auxin)的研究成果。

　　1．Which of the following is TRUE of auxin according to the text?

　　A．It helps the plant to bend at the right places while growing.

　　B．It prevents the roots of plants from growing faster.

　　C．It is no use when the surroundings have changed.

　　D．It helps the underside of plants grow faster than the topside.

　　【解析】　细节理解题。植物生长素的功能在第二段中体现的是resulting in the underside growing faster，故选D。

　　【答案】　D

　　2．From Paragraph 3 we know that ．

　　A．the researchers are not so sure if the transport for auxin is a new one

　　B．the levels of auxin remain the same during the growing processes of plants

　　C．PILS proteins delay the growth of plants

　　D．PILS proteins play an important part in the transport of auxin

【解析】　细节理解题。由The researchers identified an important new link and