单项选择题

Not having been discovered，many laws of nature actually exist in nature．

A．虽然许多自然界的规律尚未被发现，但它们确实存在于自然界中。
B．存在大自然中的很多法律还没有被科学界发明出来。
C．许多自然界的规律实际上存在于自然界中，尽管不能被发现。
D．尽管很多自然界的规律没有被找出，但是这些规律实际上存在于自然界中。
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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
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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