A:学习是每个人都要经受的酷刑,是逃不过的劫难
B:学习是一件十分快乐的事情,充满乐趣,没有苦恼
C:学习是苦乐交织的,我们要刻苦努力;充分享受其中的乐趣
D:学习对于有些人来说只有痛苦,对于有些人来说只有快乐
下面是光学显微镜观察植物叶表皮气孔时的几个操作步骤。要把显微镜视野下的图像从下图中的甲转为乙,规范的操作步骤是①移动载玻片 ②调节光圈和反光镜③转动转换器 ④转动细准焦螺旋⑤转动粗准焦螺旋
a.如图甲,将毛巾铺在水平木板上,让小车从斜面顶端由静止滑下,观察小车在水平面上通过的距离。
b.如图乙,取下毛巾,将棉布铺在斜面和木板上,让小车从斜面顶端由静止滑下,观察小车在水平面上通过的距离。
c.如图丙,取下棉布,让小车从斜面顶端由静止滑下,观察小车在水平面上通过的距离。
请针对以上操作回答下列问题:
阅读短文,根据短文内容选择正确答案。
Hi, I am Li Ping. I am from a small village. There are many houses and rivers in my village. The houses are very beautiful. The water is clean. You can see many fish in the river. There is a mountain near our village. There aren't any pandas in the mountain. But there are many trees on the mountain. A big forest is not far from the mountain. My village is pretty. I like my village.