[单项选择]下列选项中，构成缔约过失责任情形的是( )。
A. 一物二卖
B. 达成购买房屋的协议，但是没有办理房屋过户手续
C. 未办理抵押登记的汽车抵押合同
D. 因家庭生活状况严重恶化不再履行赠与义务

Section Ⅱ Reading Comprehension Part A Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1. Text 1 Last November, engineers in the healthcare division of GE unveiled something called the "Light Speed VCT", a scanner that can create a startlingly good three-dimensional image of a beating heart. This spring Staples, an American office-supplies retailer, will stock its shelves with a gadget called a "wordlock", a padlock that uses words instead of numbers. The connection In each case, the firm’s customers have played a big part in designing the product. How does innovation happen The familiar story involves scientist in academic institutes and R&D labs. But lately, corporate practice has begun to challenge this old, fashioned notion. Open source software development is already well-known. Less so is the fact that Bell, an American bicycl
A. benefit from customer innovation.
B. challenge academic institutes and R&D labs.
C. are pioneers in adopting customer innovation.
D. are predominant in new products research.