单选题
综合类
2016-02-18
Paragraph 4 __________
A．Reason why not many scientists carry out this research nowadays
B．Report about washoe's progress in learning sign language
C．General information about washoe
D．The gardeners' contributions recognized
E．Debate on chimps' intelligence
F．Washoe's love for three young chimps
参考答案
A
答案解析
第四段解释了为什么现在从事这项研究的科学家人数不多，部分原因是由于研究周期太长，所以答案为A。
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