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【简答题】
The youngest climber to reach the top of Mount Qomolangma, hugged (拥抱) his team members and told them he loved them. Then 13-year-old Jordan Romero took the satellite (卫星) phone and called his mom. 'He says, 'Mom, I'm calling you from the top of the world. I love you!' I just told him to get home safely,' his mother told the reporters from California. She had been watching her son's progress minute by minute online. Returning from Saturday's success on the world's highest mountain, at 8,850 meters above sea level, Jordan said when he was interviewed, 'Every step I took was finally toward the biggest goal of my life, to stand on the top of the world.' 'I was encouraged by a painting in my school of the highest mountains on all seven continents (洲). I want to climb up all of them.' He climbed Mount Kilimanjaro in Africa when he was 9 years old. Before him, the youngest climber to reach the top of Mount Qomolangma had been Temba Tsheri of Nepal at the age of 16 in 2001. 根据短文内容,选择最佳选项。 1. On the top of Mount Qomolangma Jordan did the following EXCEPET _______. A. hug his team members B. chat with his mom online C. tell his mom he loves her D. give his mom a phone call 2. What was Jordan's mother doing while he was climbing Mount Qomolangma? A. She was surfing the Internet. B. She was talking to Jordan on the phone. C. She was receiving a reporter's interview. D. She was watching Jordan's progress online. 3. From the passage we know that Mount Qomolangma is the ______ highest mountain Jordan has ever climbed up. A. first B. second C. sixth D. seventh 4. When did Jordan make up his mind to climb up the highest mountains on all seven continents? A. After he reached the top of Mount Qomolangma. B. After he returned from the top of Mount Qomolangma. C. After he saw a painting of the highest mountains at school. D. After Temba Tsheri reached the top of Mount Qomolangma. 5. Which of the following is NOT true? A. Mount Kilimanjaro is the highest mountain in Africa. B. Jordan reached the top of Mount Qomolangma on Saturday. C. Some reporters interviewed Jordan on the top of Mount Qomolangma. D. The youngest person to reach the top of Mount Qomolangma before Jordan was 16.
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【单选题】荠菜的果实为()。
A.
角果
B.
翅果
C.
蓇葖果
D.
荚果
【单选题】荠菜的果实形状有三角形和卵圆形两种 , 该性状的遗传由两对等位基因控制 。 将纯合的结三角形果实的荠菜和纯合的结卵圆形果实的荠菜杂交, F1全部结三角形果实,F2的表现型及比例是三角形果实植株 ∶ 卵圆形果实植株= 15 ∶ 1。下列有关说法正确的是 ( )
A.
对 F1测交,子代表现型的比例为1 ∶ 1 ∶ 1 ∶ 1
B.
荠菜果实形状的遗传不遵循基因的自由组合定律
C.
纯合的结三角形果实植株的基因型有 4种
D.
结卵圆形果实的荠菜自交,子代植株全结卵圆形果实
【简答题】荠菜的果实形成有三角形和卵圆形两种,该形状的遗传涉及两对等位基因,分别是A、a,B、b表示。为探究荠菜果实形状的遗传规律,进行了杂交实验(如图)。 图中F 2 三角形果实荠菜中,部分个体无论自交多少代,其后代表现型仍然为三角形果实的。这样的个体占F 2 三角形果实荠菜中的比例为();还有部分个体自交后发生性状分离,它们的基因型是()。
【单选题】荠菜的果实为()。
A.
瘦果
B.
翅果
C.
角果
D.
荚果
【单选题】下列关于SQL Server 2008中分区表的说法,正确的是
A.
分区表是对表中数据进行垂直划分
B.
分区表是从物理上将一个大表划分为几个小表
C.
创建分区表后,用户必须针对每个小表进行操作
D.
分区表中的每个分区必须映射到不同的文件组中
【单选题】下列关于SQL Server 2008数据库的说法,正确的是()。
A.
一个数据库可由多个数据文件和多个日志文件组成
B.
一个数据库只能包含一个日志文件,但可包含多个数据文件
C.
一个数据库的所有数据文件必须存放在相同的物理位置
D.
一个数据库的数据文件和日志文件必须存放在不同的物理位置
【单选题】关于SQL Server2008文件组的叙述正确的是________。
A.
一个数据库文件不能存在于两个或两个以上的文件组里
B.
日志文件可以属于某个文件组
C.
一个文件组可以包含不同数据库的数据文件
D.
一个文件组的文件只能放在一个存储设备中
【单选题】荠菜的果实形状由两对基因A、a和B、b(独立遗传)控制,只要有一个显性基因,果实形状就是三角形,无显性基因(aabb)存在时,果实形状为卵形。现有一基因型为AaBb的荠菜自交,其后代中结三角形果实的与结卵形果实的荠菜数量比是()
A.
15:1
B.
12:3:1
C.
9:7
D.
9:6:1
【简答题】荠菜的果实形状有三角形和卵圆形两种,该性状的遗传涉及两对等位基因,分别是A、a和B、b表示。为探究荠菜果实形状的遗传规律,进行了杂交实验(如右图)。 图中F 2 三角形果实荠菜中,部分个体无论自交多少代,其后代表现型仍然为三角形果实,这样的个体在F2三角形果实荠菜中的比例为();还有部分个体自交后发生性状分离,它们的基因型是()。
【单选题】n个结点的线性表采用数组实现,算法的时间复杂度是O(1)的查找是( )
A.
访问第i(1≦i≦n)个和求第i个结点的直接前驱(2≦i≦n)
B.
在第i个结点后插入一个新结点(1≦i≦n)
C.
删除第 i(1≦i≦n)个结点
D.
以上都不对
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