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【单选题】
引力波是根据()理论给出的预言。A.
大爆炸理论
B.
广义相对论
C.
狭义相对论
D.
马赫原理
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举一反三
【单选题】Some teenagers _____ their health because they often expose themselves to so many electric products. [ ]
A.
have damaged
B.
are damaging
C.
damaged
D.
will damage
【单选题】Which of the following methods is often used by advertisers to get us buy their products?
A.
Make us feel dissatisfied with ourselves and our lives.
B.
Make us afraid that people won’t like us if we don’t use the advertised products.
C.
Write different ads for different groups of people.
D.
All of the above.
【简答题】Research and Development Dept.(R&D)
【简答题】What is R&D dept.?
【简答题】Using tables of reduction potentials, predict the products of the reac tions of withexcess(a)Fe 2+ (b)Zn (c)Fe (d)H -
【单选题】We learn from the text that users of wireless products are more often than not confronted with
A.
missing networks.
B.
technical failures.
C.
wrong standards.
D.
confusing choices.
【简答题】They often choose to advertise their products ______ _______.
【单选题】（ ）products often feature games with learning embedded into them.
A.
Program
B.
Database
C.
Software
D.
Multimedia
【单选题】Industrial products are often the result of ______ according to the passage.
A.
laboratory work
B.
market survey
C.
commercial research
D.
business growth
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