细胞因子所不具备的作用特点是（） A.拮抗性 B.特异性 C.多效

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问题单项选择题

细胞因子所不具备的作用特点是（）

A.拮抗性

B.特异性

C.多效性

D.重叠性

E.网络性

答案

参考答案：B

解析：细胞因子的共性为多效性、重叠性、拮抗性、协同性、双向性及网络性。

填空题

根据短文内容及首字母提示填空，使其意思完整。

Typhoon is a very big wind.It usually starts at s l in July, August and September.

How does a typhoon h 2 ? In summer. when the sun heats down on the sea, the water gets hot.

Then the hot water evaporates (v.蒸发) and goes up into the a 3 . This makes the air hotter. When

the air gets warm enough, it starts to move h 4 up into the sky, and starts to move quickly, making

wind. The wind goes in circles, and it keeps moving higher in the sky. And when the wind moves faster

than 30 meters a second, a typhoon begins.

Typhoons are very d 5 . When a typhoon happens, it usually causes (引起) strong winds and heavy rain. We should be careful when a typhoon is coming.

1. 2. 3. 4. 5.

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