单项选择题

Some scientists believe that a breakthrough in the use of solar energy depends on _________.

A．advanced technology
B．further experiments
C．sufficient funding
D．well-equipped laboratories
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单项选择题
The phrase were subject to in Para. 5 means _________.
A．obey a law
B．were more resistant to a disease
C．were likely to suffer from an illness
D．were interested in a subject
单项选择题
According to the passage, Professor Laura and Mr. Ashton's research on skin cancer _________.
A．is a big challenge to the traditional skin cancer theory
B．has been accepted by the medical world
C．is a new development to the old theory
D．is criticized by medical scientists
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