问题
单项选择题 A1型题
参与哮喘慢性气道炎症的主要介质为（）
A.5-羟色胺
B.白三烯
C.α-干扰素
D.肿瘤坏死因子
E.前列腺素G
答案
参考答案：B
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参与哮喘慢性气道炎症的主要介质为（）
A.5-羟色胺
B.白三烯
C.α-干扰素
D.肿瘤坏死因子
E.前列腺素G
参考答案：B
| 从方框中选择合适的词或短语,并用其正确形式完成短文. | |
ears. My friend's father quickly 2._______ some bags of litter and went outside. I asked my friend, "What's going on?" My friend said that there was a truck 3._______ litter outside. "Whenever someone throws some litter in, it gives out beautiful music. 4._______ other people hear it, they'll go out with their litter and throw it in." "It's a 5._______ way to help keep our city clean," said my friend. 6._______ our environment is very important. Wherever you live, you can do something around your neighbourhood. Have you ever thrown 7._______ litter onto the ground? Have you ever drawn pictures on public walls? Have you ever spat in public? Have you ever 8. _______ trees? If your answers are "No", it means that you have already helped 9. ________ our environ  ment.It is our duty to keep our environment clean and tidy. If everyone 10._______ to protect the environment, the world will become much more beautiful. |
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