皮皮学，免费搜题
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【简答题】
肺是由许多肺泡组成的，肺泡外面包绕着丰富的______，它们都是由一层扁平的上皮细胞构成．当你吸气时，肺泡鼓起，空气中的______进入血液；同时，血液中的______进入肺泡，完成气体交换．
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举一反三
【单选题】Listen to the following dialogues, and then choose the best answer for each of the following questions.
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Give money to the community.
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Give back 4 hours of his time.
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Give back 2 to 3 hours of his time.
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【单选题】Listen to the following passage and choose the best answer for the question. Which one of the following is not true about the immigrants ?
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C.
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【单选题】Listen to the following dialogues, and then choose the best answer for each of the following questions.
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Doctors.
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相关题目：
【单选题】Listen to the following dialogues, and then choose the best answer for each of the following questions.
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Give money to the community.
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用喷壶撒在其上
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【简答题】Listen to the following two news reports and choose the best answer to each of the following questions.
查看完整题目与答案
【单选题】Listen to the following passage and choose the best answer for the question. Which one of the following is not true about the immigrants ?
A.
It was not easy for them to arrive in the United States.
B.
Many immigrants could hardly integrate themselves into the American society.
C.
Many immigrants started a new life in the United States in spite of various difficulties.
D.
The United States is called a melting pot   because immigrants from different countries have formed an integrated country.
查看完整题目与答案
【多选题】关于肌张力障碍,叙述正确的是
A.
肌肉收缩可快可慢
B.
表现为重复 、 模式化
C.
张力以可预测的形式由低到高变动
D.
以持续和扭曲的不自主运动为特征
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由中枢神经系统缺陷所致
查看完整题目与答案
【单选题】Listen to the following dialogues, and then choose the best answer for each of the following questions.
A.
Doctors.
B.
Volunteers.
C.
Medical care.
D.
All of the above.
查看完整题目与答案