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【多选题】
消费者行为分析常用的研究方法是A.
观察法
B.
调查法
C.
实验法
D.
抽样法
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反馈参考答案：
举一反三
【单选题】Why does the professor mention fossils?
A.
To describe the evidence Wegener used to develop his theory.
B.
To suggest that Wegener borrowed ideas from earlier scientists.
C.
To explain how Wegener first became interested in geology.
D.
To show why most scientists ridiculed Wegener's theory.
【单选题】Agriculture was a step in human progress ______ which subsequently there was not anything comparable until our own machine age.
A.
to
B.
for
C.
in
D.
from
【简答题】读卡器是一种输入设备。（ ）
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