单项选择题

We were glad to learn from your letter of 18th July of your interest in our products. Here are the catalogues and price-list for which you asked. Also you will find details of our conditions of sale and terms of payment.
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单项选择题
When we speak，sound waves begin to travel and go in all 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．当说话时，声波开始旅行，并且走向四面八方。
单项选择题
Reading is learning, but applying is also learning and the more important kind of learning at that.
A．看书是学习，但是应用也是学习，同时更重要的学习种类是那样。
B．读书是学习，使用也是学习，而且是更重要的学习。
C．阅读是学习，但是实施也是学习，更重要的学习种类在那点上。
D．读书是学习，但使用也是学习，并且是更重要种类的学习。
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