logo - 刷刷题
下载APP
【单选题】

香蕉枯萎病主要侵害维管束,()症状明显

A.
苗期
B.
成株期
C.
近结果期
D.
初蕾期
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】首先出现胚的植物和首先出现维管束的植物依次是()。

A.
藻类、种子植物
B.
藻类、种子植物
C.
藻类、蕨类植物
D.
苔藓、蕨类植物

【多选题】胡椒枯萎病在的传播途是( )

A.
带病种苗调运进行远距离传播。
B.
种子带毒传播。
C.
土壤传播
D.
地面流水传播
E.
农具传播
F.
割蔓传播

【单选题】双子叶植物根维管束类型为

A.
有限外韧型
B.
双韧型
C.
无限外韧型
D.
周木型
E.
辐射型

【多选题】具有同心环形异型维管束的中药有()。

A.
鸡血藤
B.
牛膝
C.
商陆
D.
大血藤
E.
大黄 ABCDE

【单选题】An elm in our backyard(7)the blight (枯萎病) this summer and dropped stone dead, leafless, almost overnight. One weekend(8)was a normal-looking elm, maybe a little bare in spots but(9)alarming, and the n...

A.
There are so many new books about dying that there are now special shelves set aside for them in bookshops, along with the health-diet and home-repair paperbacks. Some of them are so(1) with detailed information and step-by-step instructions for performing the function, that you’d think this was a new sort of(2)which all of us are now required to learn. The strongest impression the casual reader gets is that proper dying has become an extraordinary,(3)an exotic experience, something only the specially trained can do.
B.
(4), you could be led to believe that we are the only(5)capable of being aware of death, and that when the rest of nature is experiencing the life cycle and dying, one generation after(6), it is a different kind of process, done automatically and trivially, or more "natural", as we say.

【单选题】具多环性同心环维管束的是

A.
沉香
B.
大黄
C.
川牛膝
D.
何首乌
E.
狗脊