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
<上一题 目录 下一题>
热门 试题

单项选择题
It can be inferred from the passage that traditional skin cancer theory says _________.
A．natural sunlight may help prevent skin cancer
B．artificial light is too weak to cause skin cancer
C．exposure to the sunlight may cause skin cancer
D．Vitamin D is very important in preventing skin cancer
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
相关试题