Further treatment will help to prevent him from （develop) ________ cancer.

Read the attached project statement, develop a use case model for the AP system. Your model should identify about ten use cases. Distinguish Provide Web Access as one of the use cases. Show the most important relationships, including (if applicable) <<extend> > and < <include> > relationships. Make the distinction between both-directional and uni-directional associations, when appropriate. Use generalizations and dependency relationships (in particular with regard to actors). Describe the meaning of the model, including any assumptions you have made, in text under the diagram.

A new study suggests that thick crustal plugs and weakened mineral grains may explain a range of relatively speedy moves among tectonic plates around the world, from Hawaii to East Timor. Traditionally, scientists believed that all tectonic plates were pulled by subducting slabs—which resulted from the colder, top boundary layer of the Earth's rocky surface becoming heavy and sinking slowly into the deeper mantle. Yet that process does not account for sudden plate shifts. Such abrupt movement requires that slabs detach from their plates, but doing this quickly is difficult since the slabs should be too cold and stiff to detach. According to the study, there are additional factors at work. Thick crust from continents or oceanic plateau is swept into the subduction zone, plugging it up and prompting the slab to break off. The detachment process is then accelerated when mineral grains in the necking slab start to shrink, causing the slab to weaken rapidly. The result is tectonic plates that abruptly shift horizontally, or continents suddenly bobbing up. The passage is primarily about

A、the results from new research.

B、the weaknesses of mineral grains.

C、how crust is subducted on the earth’s surface.

D、the types of tectonic plates.

A、Her mother would remind her.

B、The rain fell for a week; therefore, every street in the city was flooded.

C、Because the rain fell for a week, every street in the city was flooded.

D、She wanted to make sure that her mother wasn’t watching.