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
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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
单项选择题
Professor Laura believes that his research _________.
A．has been supported by many scientists
B．has a profound significance
C．has established a new theory on Vitamin Ｄ
D．has changed people's concept of skin cancer
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