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。
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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.
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.
单项选择题
Light goes three quarters of the way from the earth to the moon in one second.
A) 光一秒钟以后能走完25%的距离，从地球到月球。
B) 光在一秒钟内可以完成地球到月球距离的四分之三。
C) 光一秒可以走过地球至月球距离的四分之三。
D) 光一秒钟可以通过地球到月球距离的四分之三。
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