单项选择题

A major point of this passage is that ______.

A．good locks are essential to home's security
B．there are many types of security alarm systems for the home
C．an ounce of prevention is worth a pound of cure
D．there are burglar alarm systems that can be installed without professional help

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单项选择题

According to the passage, ______.

A．security alarm systems can only be installed in commercial and industrial establishments and in large homes
B．security alarm systems are still very expensive
C．now, people can buy low-cost security alarm systems and install themselves
D．security alarm systems can't scare off vandals

单项选择题

The phrase close his options in the last paragraph means ______ .

A．change the topic
B．get too close to you
C．make a decision.
D．limit his choice