问题
选择题
异面直线所成角θ的范围是（ ）
A．0°＜θ＜90°
B．0°＜θ＜180°
C．0°＜θ≤90°
D．0°≤θ＜90°
答案
空间两条直线的夹角θ的范围是0°≤θ≤90°，
当θ=0°时，两条直线平行或重合
当两条直线为异面直线时，
两直线不可能平行，
故θ≠0°，
故异面直线所成角θ的范围是0°＜θ≤90°
故选C
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异面直线所成角θ的范围是（ ）
A．0°＜θ＜90°
B．0°＜θ＜180°
C．0°＜θ≤90°
D．0°≤θ＜90°
空间两条直线的夹角θ的范围是0°≤θ≤90°，
当θ=0°时，两条直线平行或重合
当两条直线为异面直线时，
两直线不可能平行，
故θ≠0°，
故异面直线所成角θ的范围是0°＜θ≤90°
故选C
完成句子(共10小题；每小题1.5分，满分15分) 阅读下列各小题，根据括号内的汉语提示，用句末括号内的英语单词完成句子，并将答案写在答题卡上的相应题号后。
31.They sat together around the table,with_______(门关着).(shut) 32.I haven’t the slightest idea____(他正在说什么).(talk) 33.The fact____(他失败了数次) makes him very upset.(he,fail) 34.Last night,John was answering the letters that____(寄给他的) during the past two weeks.(arrive) 35.He believes that children____(应允许……学习) at their own pace.(allow) 36.She has an excellent____(对名字的记忆力),which helps her quite a lot in her work.(memory) 37.____(他是否出过国) doesn’t make much difference.(he,abroad) 38.The factory’s output of cars this year is____(大约是去年的三倍).(as,great) 39.Not only____(要帮助) the disabled to find jobs,but also medical treatment will be provided for those who need it.(give) 40.It is possible that the King of Stonehenge was linked to the stones;he____(可能参与) in planning the monument,or in helping transport and pull up the stones.(hand) |