单项选择题

Usually you will not get a shock by touching the electric ray in one place only because______.

A．the current in one place is not strong enough to give a shock
B．the fish' s electric cells are filled with jelly-like substance
C．to complete the circuit, you have to touch the fish in two places
D．a torpedo' s electric cells contain more than one electric plates

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单项选择题

Which of the following can best explain AIDS tests the institutions upon which our society rests according to the passage

A．AIDS is a sign of moral failure and social collapse.
B．AIDS indicates that our social systems have been very inefficient.
C．The responses of a society to the threat of AIDS determines whether and to what extent the society can be called civilized.
D．The spreading of the fatal disease suggests that the nation' s resources have been wrongly use

单项选择题

Why did the author offer the AIDS course

A．He wanted to teach people about a cure for AIDS.
B．People need to be taught how to avoid those with AIDS.
C．He wanted to teach the students that AIDS resulted from moral failure.
D．People take improper attitudes towards AIDS and those with or at high risk of AIDS.