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【判断题】
生产环境和劳动过程中的危害因素可以分为化学性因素、物理性因素和生物性因素三个方面。化学性因素包括毒物、粉尘等；物理性因素包括噪声、振动、高温、电离辐射等；生物性因素包括致病微生物和寄生虫等。A.
正确
B.
错误
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举一反三
【简答题】People should____________(接受自然光的照射), since the light outside is always brighter than what they get in offices.
【单选题】The largest part of the light energy directed towards the earth is ______
A.
stored up by the plants
B.
absorbed by the earth's atmosphere
C.
stored up by the animals in the form. of body fat
D.
used for electric power
【单选题】Where is the post office?
A.
Next to the cinema.
B.
On the left-hand side of the light.
C.
On the opposite side of the cinema.
【单选题】What is the news item mainly about?
A.
The work of the two Nobel laureates sheds light on the tiny building blocks of life-cells.
B.
The work of the three Nobel laureates sheds light on the huge building blocks of life-cells.
C.
The work of the three Nobel laureates sheds light on the tiny building blocks of life-cells.
D.
The work of the three doctors sheds light on the tiny building blocks of life-cells.
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