单项选择题

From the passage we know that caterpillars______.
A．like willow trees
B．enjoy eating fallen leaves
C．talk to caterpillars
D．send a special vapor

A.
A．like
B.enjoy
C.talk
D.send

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单项选择题

Caterpillars will stop eating willow tree leaves which______.
A．have a chemical change and become tasteless
B．have a pleasant taste
C．are being attacked
D．are communicating

A.
A．have
B.have
C.are
D.are

单项选择题

实验法根据控制程度可分为（）

A.实验室实验和现场实验
B.探索性实验和验证性实验
C.单因素实验和多因素实验
D.真实验和准实验