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A．It still requires further improvement.
B．It is a little complex to charge a cell phone with the material.
C．It can produce the power needed by an iPhone.
D．It is a little expensive to manufacture this material.
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单项选择题
A．It may lead to some health problems. B．It is not an effective way to deal with anger. C．It may result in some mental problems. D．It may make people angrier.
A．It may lead to some health problems.
B．It is not an effective way to deal with anger.
C．It may result in some mental problems.
D．It may make people angrier.
单项选择题
A．It is quite expensive and requires the teens to save their allowance. B．It can be purchased one at a time so it can be afforded by the teens. C．There are only fruit flavored cigars available at the market. D．Most teens buy cigars because of peer affection.
A．It is quite expensive and requires the teens to save their allowance.
B．It can be purchased one at a time so it can be afforded by the teens.
C．There are only fruit flavored cigars available at the market.
D．Most teens buy cigars because of peer affection.
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