问题
选择题
Scientists said the smaller the airborne particles, the more ______ they are to cause illness.
A．possible
B．likely
C．probable
D．perhaps
答案
答案：B
题目分析：考查形容词。本题考查短语的固定搭配：be likely to有可能……。句意：科学家说，空气尘埃粒子越小，它们造成疾病的可能性越大。故B正确。