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【单选题】

68. The best title for the text would be_______-
(
D
They first arrived on British ships almost 200 years ago, with the aim of cutting back a rapid growth of rat (鼠) population. Then the cats themselves became the problem. After dealing with the rats, they turned to birds-and now hundreds of them have been killed in a move to protect rare (稀有) birds. Even cat lovers have been persuaded to back the move, after being told that there was no other choice.
When British sailors took control of Ascension Island in 1815, they found nobody living on it but that it was overrun with rats which had escaped from sinking ships. They introduced cats to kill the rats-and were soon overrun by cats. By 1820 they were sending back to England for dogs to kill the cats, but that didn ' t work. Ever since, the wild cat population has been attacking the birds.
Man introduced these cats, and it has disturbed the balance. Ascension Island is a most important seabird gathering place. We have to undo man’s cats here. Action has been taken to kill off wild cats for the protection of birds. Only cats raised as pets are allowed.
Since they are micro-chipped(加电子芯片的) , if they get caught they can be sent back to their owner. The action can be considered rather successful. The cat population is down to the last few-they ' re the most difficult ones to catch.
68. The best title for the text would be_______-
(

A.
Killing Cats to Save Rats
(
B.
Problems with Shipping Cats
(
C.
Fighting between Cats and Rats
(
D.
Keeping the Rat Population Down


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举一反三

【单选题】芯片74181可完成________。

A.
16种算术运算
B.
16种逻辑运算
C.
8种算术运算和8种逻辑运算
D.
16种算术运算和16种逻辑运算

【单选题】RAM 6116 芯片地址线及数据线为( )。

A.
1条地址线;16条数据线
B.
10条地址线;8条数据线
C.
11条地址线;8条数据线
D.
10条地址线;16条数据线

【单选题】基因芯片的应用领域包括

A.
疾病诊断
B.
环境监测
C.
食品卫生
D.
药物筛选
E.
以上都是

【单选题】RISC芯片的特点之一是( )

A.
大多数指令在一个机器周期内完成
B.
有丰富的指令寻址方式
C.
一条指令可多次访问存储器以取得操作数
D.
指令数量大,种类多
相关题目:
【单选题】芯片74181可完成________。
A.
16种算术运算
B.
16种逻辑运算
C.
8种算术运算和8种逻辑运算
D.
16种算术运算和16种逻辑运算
【单选题】RAM 6116 芯片地址线及数据线为( )。
A.
1条地址线;16条数据线
B.
10条地址线;8条数据线
C.
11条地址线;8条数据线
D.
10条地址线;16条数据线
【单选题】基因芯片的应用领域包括
A.
疾病诊断
B.
环境监测
C.
食品卫生
D.
药物筛选
E.
以上都是
【单选题】RISC芯片的特点之一是( )
A.
大多数指令在一个机器周期内完成
B.
有丰富的指令寻址方式
C.
一条指令可多次访问存储器以取得操作数
D.
指令数量大,种类多
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