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(1) Purposeful exercises have well-defined specific goals.If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.Explain the above figure. For the first point in the figure that does not consume down events, it is actually case 1 (default case). As can be seen from the log of case 1, when does not consume down events, subsequent events will no longer be distributed to the View, so branch 1 in the figure does not need to consider subsequent events for View.罢了，都是自己人。辽邦白天佐领兵进犯宋朝边境，将镇守在洪州城的杨延昭和十路总兵团团围住。杨宗保星夜出城，单骑突围，回转京城搬求援兵，怎奈朝中诸将俱难担当解围的重任，无人适于挂帅出征。宋王只得命八贤王赵德芳和天官寇准到天波杨府来调将，佘太君表示了一番为国为家、救国救民的赤胆忠心，但又谓杨府已无将可调。敦厚的八贤王不知如何是好，熟谙杨家的老寇准已看出其中必有原因。因而将老太君诓入后堂去为他们准备宴席，自己就拉着八贤王溜人后花园演武厅。只见园中刀枪剑戟列成林，马蹄印乱纷纷，都是新踏的印。二人又击打催金鼓，敲响鸣金锣，三通鼓响，果然见杨家男女兵将突然齐集“聚将台”前，更见穆桂英全身铠甲披挂定，威风凛凛进入演武厅，二人大喜。忽听老太君下令收兵，寇准赶忙借千岁之名传令少夫人到前厅议事。二人将洪州被困之事对她说明，她激愤不已，极欲挺身而出，可是顷刻之间却又犹豫起来，吞吞吐吐也说不出.Thymus vulgaris Thyme