单项选择题

This passage is about a______.

A．law
B．hypothesis
C．guess
D．theory
<上一题 目录 下一题>
热门 试题

单项选择题
A study of thunderclouds over the North Atlantic showed that lightning occurred only when the air temperature______.
A．around the cloud was below freezing
B．around the cloud was above freezing
C．about the cloud was lower than the temperature below the cloud
D．of the cloud was above freezing
单项选择题
Ice particles bouncing off hail falling through a cloud acquire______.
A．a negative charge
B．no electric charge at all
C．a positive charge
D．bothA) and
相关试题