The three ______ working telephone lines are quite busy following the earthquake.

A、hadn’t been working

B、aren’t working

C、weren’t working

D、didn’t work

材料：

An aircraft lift on board RFA Argus was loaded beyond its safe working load of 18.4 tonnes．There were no injuries to any personnel，or material damage to the ship or its equipment．

During a planned stay in port，500 compressed CO2 cylinders were required to be landed．These were normally stowed on a lower deck and needed to be transferred to the weather deck before being taken ashore．Before the vessel&39;s arrival in port，the planned operation was discussed between various officers and senior ratings，one of whom was to supervise final discharge of the cylinders from the ship．

Once in port，a senior rating gave instructions to three juniors to transfer a number of cylinders to the weather deck．He then left them alone to load the cylinders onto the platform. of an aircraft lift．The cylinders weighed 19.95 tonnes，which was greater than they had been instructed to load．In addition to this excess weight they added a fork lift truck weighing 5.5 tonnes．The lift was then raised．

When it reached the weather deck，the lift was unable to stow at the correct level．When investigated it was discovered that the load of both CO2 bottles and the fork lift truck was greater than its safe working load（SWL）and this had prevented the locking cleats at the flight deck（weather deck）engaging．

问题：

The lift was taken out of service for testing and inspection． The safe working load of the aircraft lift is ________ tonnes．

A.18.4

B.19.95

C.5.5

D.500

The aircraft lift was overloaded by a weight which is ________ more than its SWLA.1.55

B.3.95

C.5.5

D.7.05

It is implied in the passage that ________．A.the lift should be raised slowly to avoid the accident

B.the aircraft lift on board RFA Argus should be driven by super power

C.the senior rating should give instructions in more detail to the three juniors to transfer a number of cylinders to the weather deck

D.if the unloading operation was supervised by an officer who has sufficient experience of the loads，lifting equipment and the overall operation，the accident would had been avoided

It was the ________ that had prevented the locking cleats at the flight deck（weather deck）engaging．A.fork lift

B.CO2 bottles

C.overloaded weight

D.the three juniors

请帮忙给出每个问题的正确答案和分析，谢谢！

A.A.have worke

B.B.had been working

C.C.were working

D.D.had worked

听力原文：W: What do you do for a living, Frank？

M: I am an aerospace engineer. I have been working for NASA for over fifteen years.

W: Wow, that sounds fascinating. What projects have you been involved in？

M: Well, until recently, I was heavily involved in the Cassini mission. I don't know if you're familiar with it or not. It's one of NASA's most expensive and ambitious projects. We are sending a probe to explore Saturn and its moons.

W: That sounds really interesting. Are you in any way involved in the construction of the international space station？

M: Actually, that's what I'm working on now. I'm currently a technical liaison between NASA and several European space agencies. It's an interesting job, but it can be a bit too much at times. The international space station is probably the largest international venture ever attempted, and I am constantly dealing with technical difficulties, budget problems, and delays. It's not easy coordinating the efforts of all those countries. I have been to Europe three times in the last month, and I have to go to Kazakhstan next week.

W: And I understand there's some controversy surrounding the space station. Don't some people worry that NASA is spending too much money on the project？

M: Many experts have complained that the project has grown out of control and become far too expensive. But I look at it as more than a space station; I believe it's helping to foster international scientific cooperation. It's nice to see the scientists of the world working together to create a stepping-stone to the future.

(20)

A．It plans to send a probe to explore the moon.

B．It's NASA's most expensive project so far.

C．It's an ambitious project.

D．It's involved in the construction of the American space station.

A. going on

B. working on

C. studying for

D. sitting on