雷诺现象的皮肤颜色变化顺序为()
A.红→白→紫
B.紫→红→白
C.紫→白→红
D.红→紫→白
E.白→紫→红
参考答案:E
Most members of the committee were in favour of the suggestion; only a(n)________were against it. [ ]
A. majority
B. minority
C. quantity
D. amount
如图为根尖结构模式图,据图回答问题:
(1)在根尖结构中,具有保护作用的是[______]______;
(2)细胞始终保持分裂能力的部位是[______]______;
(3)根细胞不断伸长的部位是[______]______;
(4)吸收水分和无机盐的主要部位是[______]______.
(5)当该区细胞中细胞液浓度______(填“大于”或“小于”)土壤溶液浓度时,根细胞吸水.