问题
选择题
用显微镜观察叶下表皮临时装片时,发现一气孔位于视野的右下方。要想使该气孔移至视野中央,装片应移向
A.左上方
B.左下方
C.右上方
D.右下方
答案
答案:D
本题考查的是显微镜的使用。在显微镜下观察到的是倒像,即上下颠倒,左右也颠倒。所以物象位于视野的右下方,实际是在左上方,应向右下方移动装片才能使要观察的物象移至视野的正中央。
用显微镜观察叶下表皮临时装片时,发现一气孔位于视野的右下方。要想使该气孔移至视野中央,装片应移向
A.左上方
B.左下方
C.右上方
D.右下方
答案:D
本题考查的是显微镜的使用。在显微镜下观察到的是倒像,即上下颠倒,左右也颠倒。所以物象位于视野的右下方,实际是在左上方,应向右下方移动装片才能使要观察的物象移至视野的正中央。
Jerry在欣赏一篇美文,可是中间缺了一些词,请你动动脑筋从所给的四个选项中选出恰当的词,使它成为一篇完整的短文。 | ||||
A rich father wanted to show his son how poor people can be. One day, he took his young son 1 a trip to the country. They 2 a day and night in the farm of a very 3 family. When they got back from their trip the father asked his son, "how was the 4 ?" "Very good, Dad!" "Did you see how poor people can be?" the father asked. "Yeah!" "And what did you 5 ?" The son answered, "I saw that we have a dog at home, but they have four. We have a pool that reaches to the middle of the garden. They have a small river that has no 6 . We have expensive lamps in the garden, but they have the 7 . Our…" When the little boy was finishing, his father was 8 . His son added, "Thanks, dad, for showing me 9 poor we are!" Isn't it true that it all depends on the way you look at things? If you have love, friends, family, health, good humor and a positive attitude (积极的态度) toward life, you've got 10 ! | ||||
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