155. A: What are the selling points of your product？
 B: _____
(A)In addition toa vast network of distributors across the country, we have more than 30 offices around the world.
(B)It's designed to conserve energy and it rarely needs servicing.
(C)If you order 200 units or more, you will receive a five percent special discount.
(D)It is compact, easy to use, and is the most powerfultool in its class. 。