单项选择题 Wolfe Constructions 121 Fifteenth Street Melbourne 200430 88880000 http: // www. Wolfecon. comDate: October 3, 2009TO: Thomas S. Wolfe, PresidentFrom: Jack Evans, Project ManagerSubject: Progress on Hillcrest Apartments for SeptemberConstruction on the Hillcrest Apartment complex began on August 17 and fell behind schedule almost immediately because of the heavy rains that month. Current StatusWe have not been able to make up the time that we lost in August because of the continuing rain in September. Close supervision and some overtime have prevented us from falling farther behind. We are currently 18 days behind schedule, assuming crew size remains the same and overtime is limited to emergencies only. The foundation for the entire complex is complete. Framing on the 14# townhouse and the gym is complete, and the framers will begin work on the two-bedroom units on Monday, October 6. The electrical and plumbing subcontractors will also begin work on Monday. Expected ProgressIf the weather holds through the rest of this month, I expect to be finished with framing, roofing, and siding by mid-November. That will allow us to begin work on the interiors before the winter rains begin. One possible problem is the shortage of electricians. Our subcontractor has not been willing to consider providing an additional 5 workers to help us make up for some of the time we have lost. Delays on the electrical, will, of course, delay the finish work. Nevertheless, when we move indoors, we should be able to reduce the total crew by more than 50 percent and begin using the framers and roofers on other projects.What is the main reason for the delay of the construction on Hillcrest Apartments?A．The bad weatherB．Ineffective supervisionC．Deficient crew sizeD．Complex geographical conditions

单项选择题 Where probably are the speakers?（）

单项选择题 Summary of the New ModelsTwo alternative designs for a fuel cell powered car are presented. Car A, which uses hydrogen fuel, is a sedan designed for the executive market. It provides extra luxury for the driver, but is spacious enough for family use. Car B, powered by hydrogen and oxygen, is a medium-sized Hatchback which offers a range of features for the family. While both cars are efficient for short trips, they lack the range and speed desirable for long journeys. Both cars incorporate similar safety features and fulfill the design criteria of having low exhaust emissions and using environmentally- friendly materials; however, Car B is recommended as it has slightly lower power consumption and is more economical to manufacture.Which of following statements is NOT the similarity between Car A and Car B?A．The safety features of Car A and B are of much resemblance.B．They both have a desirable range and speed for long journeys.C．Both share the features of low emission and friendliness to the environment.D．Both cars are of high efficiency for short travels.