单项选择题

图片上使用的裂隙灯显微镜观察方法是 A.
弥散光照明法 B.
直接焦点照明法 C.
后部反光照明法 D.
间接照明法

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公猪采精时需注意哪些事项？
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Sometimes two couples go out together. This is known as “ ______ dating”. Group dating is also ________ among young people. Large groups of boys and girls may _________ together. Young people may go out together for a long time, which is, ________, a public statement of their ________ to marry. Men and women go out together ___________ especially those in cities.
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