Goffin's cockatoos, a kind of small parrot native 1Australasia, have been shown to have similar shape-recognition abilities2a human two-year-old. Though not known to use tools in the wild, the birds have proved skilful at tool use while 3（keep） in the cage. In a recent experiment, cockatoos4(present)with a box with a nut inside it. The clear front of the box had a "keyhole" in a geometric shape, and the birds were given five differently shaped "keys" to choose from. 5(insert) the correct "key" would let out the nut.
In humans, babies can put a round shape in a round hole from around one year of age, but it will be another year6they are able to do the same with less symmetrical（对称的）shapes.His ability to recognize that a shape will need to be turned in a specific direction before it will fit7(call) an "allocentric frame of reference". In the experiment, Goffin's cockatoos were able to select the right tool for the job, in most cases, by 8(vision) recognition alone. Where trial-and-error was used, the cockatoos did better than monkeys in similar tests. This indicates that Goffin's cockatoos do indeed possess an allocentric frame of reference when moving objects in space, similar to two-year-old babies.
The next step, according to the researchers, is 9(try) and work out whether the cockatoos rely entirely on visual clues（线索）, 10also use a sense of touch in making their shape selections.
解析：
1. to考固定搭配 be native to
2. to考固定搭配 have similar abilities to sb
3. kept 考状语从句的省略 while (they were) kept
4. were presented 考谓语动词，cockatoos是主语，缺谓语，考虑时态语态单复数。
5. Inserting 考V-ing 作主语
6. before 考固定句型，这个题有点难度，很考察学生的水平，it will be 时间段 before 从句 还要过多久才，这句话的意思是：人类一岁左右的孩子可以把一个圆形物品放到圆孔里，但是还要再过一年才能匹配没那么对称的图形。
7. is called 考谓语动词 这个题也很有难度，考察学生的句法分析能力。主语是 his ability， to recognize 是定语，recognize后又跟了宾语从句，宾语从句中又有一个状语从句 before it will fit. 识别一个形状需要被以某个特定方向转下才能匹配的能力被称为“非自我中心参照系”
8. visual 考词汇变形 vision对应的常见形容词有两个：visual：视觉的、视力的（最直接、最常用）visionary：有远见的、空想的（多用于比喻意义）此处意为 视觉识别9. to try 考不定式作表语，因为主语是next step
10. or 考固定搭配 wether...or...是...还是...
Goffin's cockatoos, a kind of small parrot native to Australasia, have been shown to have similar shape-recognition abilities toa human two-year-old. Though not known to use tools in the wild, the birds have proved skilful at tool use while kept in the cage. In a recent experiment, cockatoos were presented with a box with a nut inside it. The clear front of the box had a "keyhole" in a geometric shape, and the birds were given five differently shaped "keys" to choose from. Inserting the correct "key" would let out the nut.
In humans, babies can put a round shape in a round hole from around one year of age, but it will be another year before they are able to do the same with less symmetrical（对称的）shapes. His ability to recognize that a shape will need to be turned in a specific direction before it will fit is called an "allocentric frame of reference". In the experiment, Goffin's cockatoos were able to select the right tool for the job, in most cases, by visualrecognition alone. Where trial-and-error was used, the cockatoos did better than monkeys in similar tests. This indicates that Goffin's cockatoos do indeed possess an allocentric frame of reference when moving objects in space, similar to two-year-old babies.
The next step, according to the researchers, is to try and work out whether the cockatoos rely entirely on visual clues, oralso use a sense of touch in making their shape selections.
