问题
选择题
Some people are worrying about the possibility ________ mobile phones could be responsible for a range of illnesses, from rashes(皮疹) to brain tumors．
A．that
B．why
C．how
D．whether
答案
答案：A
这题考查that引导同位语从句，修饰possibility，句意是：一些人担心手机有可能会导致一系列疾病，皮疹和脑肿瘤。选A。