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【多选题】
为什么果蝇遗传学家常使用果蝇的复眼和翅为研究对象，解决不同的生物学问题？A.
复眼有约 750 个小眼面组成，发育事件重复发生，其中部分小眼面表型有异常，基本不影响果蝇的生存。
B.
翅表面有复杂的结构，容易检测突变表型，基本不影响果蝇的生存。
C.
复眼和翅都在幼虫期就有相应的成虫盘，这些成虫盘不同的区域由不同的基因控制，从幼虫到成虫的发育过程中经历巨大的形态变化，是研究发育和其他生物学问题的模式器官。
D.
果蝇的复眼和翅有多个明显的可识别标记基因，易于作为平衡染色体的识别表型。
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举一反三
【单选题】Which of the following would be the most appropriate title for the text?
A.
The Earliest Memories
B.
Earliest Memories, Good or Bad
C.
The Power of Earliest Memories
D.
How to Recall Earliest Memories Better
【单选题】The earliest method of delivering telecommunications is the ______．
A.
telegraph
B.
telephone
C.
e-mail
D.
letter
【单选题】Which is the best title of this passage?
A.
The Earliest People in North America．
B.
The Earliest Immigrants to North America．
C.
The People of the United States．
D.
Europeans were the Earliest People Coming to the North America．
【简答题】红移现象
【简答题】Where and when was the earliest daily newspaper started? It was started in __________in__________.
【简答题】(3分)红移现象(red transition)
【单选题】Which of the following was the earliest trade route?
A.
Which of the following was the earliest trade route?
B.
The Internet
C.
Land routes
D.
Air routes
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