问题
单项选择题 A1/A2型题
唾液中主要免疫球蛋白为（）。
A.分泌型IgA（SIgA.
B.SIgB
C.SIgG
D.SIgD
E.SIgE
答案
参考答案：A
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唾液中主要免疫球蛋白为（）。
A.分泌型IgA（SIgA.
B.SIgB
C.SIgG
D.SIgD
E.SIgE
参考答案：A
| 完形填空 | ||||
| Water is the "life blood" of our earth. Like air and sunshine, it is very important 1 living things. Without water, there can be 2 life on the earth. All animals and plants need water. Man also needs water. We need water to drink, to cook and to clean 3 . It even 4 the greater part of our bodies. Water is almost everywhere. Even in the 5 places of the world, there is water in the air. However, we can drink not seawater but fresh water. To make things even 6 ,people often 7 to keep the water clean. They throw rubbish into rivers, lakes or seas. So not all the fresh water is 8 for us to drink. We're short 9 water. Something must be 10 to stop this. | ||||
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