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搜题
【单选题】
波长为多少的紫外线促维生素D合成作用较显著，可以治疗小儿佝偻病、成人骨化病A.
254～275nm
B.
275～297nm
C.
297～310nm
D.
310～340nm
E.
340nm以上
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参考解析：
知识点：
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举一反三
【单选题】Which of the following is NOT an advantages of speaking extemporaneously?
A.
none of the above
B.
It gives more precise control over thought and language than impromptu speaking.
C.
It offers greater spontaneity and directness than speaking from memory and reading from manuscript.
D.
It relieves the speaker of the burden of speaking in front of a large audience.
【判断题】有些知识学生必须自己学习掌握，有些知识通过讨论会学得更好，还有一些知识需要老师用追问的方式才能让学生学得深入，因此，作为老师，根据知识特点，设计合适的教学活动非常重要。
A.
正确
B.
错误
【单选题】To get the attention and interest of the audience, you can take the following methods except_______.
A.
posing a question
B.
telling a story
C.
making a long statement
D.
none of the above
【简答题】None of the audience (point, points) to his guilt.
【简答题】None of the audience (points, point) to his guilt.
【简答题】None of the audience (points, point) ____to his guilt.
【单选题】听力原文：(A) None of the audience has arrived yet. (B) A new released film is being shown on the screen. (C) This is a picture of a studio for film making. (D) It is completely dark in the room.
A.
B.
C.
D.
【单选题】Which of the following feedback from the audience means that you need to speak louder?
A.
They are looking puzzled and leaning forward in their seats.
B.
They are wearing earplugs.
C.
none of the above
D.
They are talking with each other in a low voice.
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