logo - 刷刷题
下载APP
【单选题】

Can trees talk Yes, but not in words. Scientists have reason to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. First, a willow tree attacked in the woods by caterpillars (毛虫) changed the chemistry of its leaves and made them taste so awful that the caterpillars got disgusted and stopped eating them. Then, even more astonishing, the tree sent out special vapors -an alarm signal stimulating its neighbors to change the chemistry of their own leaves and make them less tasty.
Communication, of course, doesn’t need to be in words. We can talk with each other by a smile, frown, or shrug of our shoulders. We know that birds and animals use a whole vocabulary of songs, sounds, and movements. Bees dance their signals, flying in certain patterns that tell other bees where to find nectar for honey. So why shouldn’t trees have ways of sending messages
According to the passage, bees communicate by ______

A.
touching one another
B.
C.
B. smelling one another
D.
C. unusual sounds
E.
D. special movements
题目标签:毛虫
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】旋毛虫对人的感染阶段是()

A.
虫卵
B.
幼虫囊包
C.
幼虫
D.
成虫
E.
以上均可以感染

【单选题】猪是旋毛虫的什么宿主

A.
中间宿主
B.
终末宿主
C.
先终末宿主,后中间宿主
D.
先中间宿主,后终末宿主
E.
转续宿主
F.
补充宿主

【单选题】蓝氏贾第鞭毛虫的感染阶段是

A.
二核包囊
B.
八核包囊
C.
小滋养体
D.
成熟四核包囊
E.
无鞭毛体

【单选题】蓝氏贾第鞭毛虫()

A.
氯喹
B.
甲硝唑
C.
乙胺嘧啶
D.
葡萄糖酸锑钠
E.
戊脘脒

【单选题】蓝氏贾第鞭毛虫的感染阶段为

A.
卵囊
B.
四核包囊
C.
二核包囊
D.
滋养体和包囊
E.
滋养体

【单选题】Man, even in the lower stages of development, possesses a faculty which, for want of a better name, I shall call Number Sense. This faculty permits him to recognize that something has changed in a sma...

A.
dependent on simpler mental activity
B.
found in animals as well as man
C.
farther up the evolutionary scale
D.
present in animals on the basis of much evidence