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1. The number of  pandas        about 1 ,600 without proper protection.   (decrease) 

由于缺少合适的保护措施,熊猫的数量已经减少到约1600只了。

1. has decreased to考查主谓一致的用法。如果the number of+复数名词作主语,谓语动词应用单数,意为"……的数量是";而a number of+复数名词作主语,谓语动词应用复数,意为"许多,大量"。另外,根据中文"减少到",可知应用短语decreaseto。

题目来源:高考丢分题英语 > Unit 4 Wildlife protection

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