This article is mainly about______.
A. making furs and clothes
B. protecting buyers with law
C. keeping the buyer informed
D. businessmen and sellers
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混凝土排水明渠水深0.4～1.0m时，最大设计流速宜采用（）m/s。
A. 2
B. 1.6
C. 4
D. 3
It can be inferred from the last paragraph that_____.
A. parents who have babies should be banned from smoking
B. less smokers regard smoking harmful than nonsmokers do
C. researchers fail to prove the harm of third-hand smoke now
D. second-hand smoke does more harm than third-hand smoke
Where are memories stored？
A. In the nerve cell bodies.
B. In the synapses.
C. In neuron connections.
D. In connection patterns.
The passage is mainly discussing______.
A. the difference between the old and the young in using words
B. the replacement of some words because their old fashion
C. the development of language
D. the cause of language change
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