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【单选题】
果蝇的体色由常染色体上一对等位基因控制，基因型BB、Bb为灰身，bb为黑身。若人为地组成一个群体，其中80%为BB的个体，20%为bb的个体，群体自由交配，其子代中Bb的比例是（）A.
25%
B.
32%
C.
50%
D.
64%
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举一反三
【单选题】When Deng Ling gave compliments to the party, she said______.
A.
I love the way you decorated the room with Christmas trees, ribbons and balloons.
B.
This is a wonderful party. I’m enjoying myself very much.
C.
I really mean it. It feels so festive and warm.
【单选题】When Li Ming introduced Deng Ling to Mary, Mary said_________.
A.
Nice to meet you.
B.
I have heard so much about you.
C.
How do you do?
【单选题】When Deng Ling had to leave for the meeting, she said_________.
A.
Keep in touch.
B.
I’m going to have to run. See you later.
C.
It’s been fun talking to you.
【单选题】When Mary talked with Deng Ling about some possibilities, she said__
A.
Yeah. It is likely that I will go to work this Saturday
B.
There’s not much chance of that happening.
C.
The chances are pretty slim.
【单选题】在 HTML 中,可以使用( d )标记向网页中插入 GIF 动画文件。 A. B. C. D. 在HTML中,可以使用( )标记向网页中插入GIF动画文件。
A.
form
B.
body
C.
table
D.
img
【单选题】绿色数据中心以电能使用效率PUE值作为能源利用效率的总体评价指标。PUE=数据中心总设备能耗/IT设备能耗，新建数据中心PUE值应至少( )。
A.
≦1.7
B.
≦1.8
C.
≦1.9
D.
≦2.0
【简答题】肺的导气部是指从( )到( )之间的部分
【简答题】在HTML中,可以使用( )标记向网页中插入音乐。A. B. C. D.
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