单项选择题

When we speak，sound waves begin to travel and go in a11 directions．

A．当人们说话时，声音向四面八方传开。
B．当我们说话时，声音就开始传播，并且向四面八方传开。
C．当我们说话时，声波开始传递，而且向四面八方传播。
D．当我们说话时，声波就开始传播，并且走向四面八方。
<上一题 目录 下一题>
热门 试题

单项选择题
This passage suggests that you______.
A．become a permanent student in the U. S. A
B．take up a summer course in the U. S. A
C．go to enjoy a tourist's in the U. S. A
D．spend a summer traveling in the U. S. A
单项选择题
The article following this passage would probably be______.
A．articles about how to obtain firsthand experience
B．advertisements of different schools
C．articles about important decisions
D．introductions to summer school courses
相关试题