题目

听材料，回答问题。 （1） Who was probably the first in the Middle Ages to believe in scientific experiments? A . Galileo, B . Roger Bacon. C . Aristotle. （2） Where did Galileo carry out his experiment? A . In France. B . In England. C . In Italy. （3） What is the main purpose of this talk? A . To praise some greatest scientists in the Middle Ages. B . To show the importance of experiments in modern science. C . To encourage listeners to make discoveries in science.用2 mL1 mol·L-1CuSO4溶液与3 mL0.5 mol·L-1NaOH溶液混合后，加入40％的甲醛溶液0.5 mL，加热至沸腾，无红色沉淀生成，实验失败的主要原因是A.甲醛的量太少B.CuSO4的量太多C.NaOH的量太少D.加热的时间太短