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托福mock test 7阅读 Fill in the missing letters in the paragraph. 题目解析

Fill in the missing letters in the paragraph.
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In the nineteenth century, Charles Darwin, along with his son Francis Darwin, proposed that the tips of plant roots act like the brains of some animals, reacting to sensations to determine their next movement. Later stu (dies)have expa (nded)on the Darwins  id (eas)Jagadish Chandra Bose's rese (arch)demonstrated th (at) plants res (pond)to sti (muli)such a (s) light. tempe (rature).and chem (icals)with electrical signals, similar to the nerve impulses in animals. This was a revolutionary idea at the time, as it suggested that plants have a form of“nervous system" that allows them to perceive and react to their environment.

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