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【简答题】
下列命题中正确的是______ ①如果平面α⊥平面β，那么平面α内所有直线都垂直于平面β ②如果平面α⊥平面β，那么平面α内一定存在直线平行于平面β ③如果平面α不垂直于平面β，那么平面α内一定不存在直线垂直于平面β ④如果平面α⊥平面γ，平面β⊥平面γ，α∩β=l，那么l⊥γ
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举一反三
【单选题】According to the passage, what are third party screeners?
A.
Those who help detect deceptions.
B.
Those who help employ workers.
C.
Those who help glee counseling.
D.
Those who help write resumes.
【单选题】According to the passage, what are third-party screeners?
A.
Those who help detect deception.
B.
Those who help employ workers.
C.
Those who help give counseling.
D.
Those who help write resumes.
【单选题】(Paragraph 4) In the third group, only 31 percent tried to help.
A.
More people decided not to help.
B.
The third group had many people.
C.
Thirty-one percent was a big number.
【单选题】It is said that _____ of the students like to help their parents with the housework
A.
third-fifths
B.
three-fifths
C.
thirds-fifth
D.
three-fifth
【单选题】执行口头医嘱错误的选项是
A.
一般情况下不执行，手术及紧急情况下执行
B.
执行后无异常，不必记录在医嘱单上
C.
执行时护士应向医生重复一遍
D.
双方确认无误后执行
【单选题】One third of the class _____ agreed to be volunteers to help the aged this vocation.
A.
are
B.
is
C.
has
D.
have
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