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【简答题】
下图是桃花的结构以及传粉过程示意图，请据图分析回答下列问题。 （1）传粉后花粉萌发长出花粉管，花粉管穿过花柱进入子房到达子房中的胚珠，释放出两个精细胞，其中一个精细胞与【7】卵细胞结合，形成受精卵。受精后，花的其他部位凋谢，子房继续发育成__________。（填器官名称） （2）子房继续发育成桃子的过程中要不断地吸收营养物质，其中所需要的无机盐是由根尖的__________ 区从土壤中吸收并通过 管运输上来的，所需要的有机物是植物进行______作用制造的。 （3）请用一个文字表达式表达出植物制造有机物的过程______ （4）已知控制桃树红色花的基因为R,控制白色花的基因是r,现在该桃树花色的基因组成为Rr，这棵桃树开______花，花色在遗传学上称为性状，红花与白花在遗传学上称为__________________
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【单选题】By the time the first European travelers on the American continent began to record some of their observations about Indians, the Cherokee people had developed an advanced culture that probably was exc...
A.
The Cherokee chief was different in wartime than in peacetime.
B.
Before the arrival of the Europeans the Cherokees had developed a well-organized society.
C.
The Mayans and the Aztecs were part of the Cherokee tribe.
D.
Several Indian cultures had developed advanced civilizations before Europeans arrived.
【单选题】The train was crowded and I had to get into a carriage______there were already seven other people.
A.
when
B.
where
C.
which
D.
that
【单选题】There were no more than seven people living in the house.In the house she found a few things for seven people.
A.
Right
B.
Wrong
C.
Doesn't say
【简答题】共析碳钢加热为奥氏体后，冷却时所形成的组织主要决定于( ) (A)奥氏体加热时的温度 (B)奥氏体在加热时的均匀化程度 (C)奥氏体冷却时的转变温度
【判断题】There were running in the garden a group of children aged from seven to twelve. 句子主语是花园
A.
正确
B.
错误
【简答题】加热时获得奥氏体的组织转变称为（ ）。A. 奥氏体化
【单选题】共析碳钢加热为奥氏体后，冷却时所形成的组织主要决定于( )。
A.
奥氏体加热时的温度
B.
奥氏体在加热时的均匀化程度
C.
奥氏体冷却时的转变温度
D.
奥氏体化后的晶粒度
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