(   ) 1. Ninety teachers and         students plant trees every year.

   A. thousands; million of

   B.  thousand; million

   C.  thousands of;millions of

   D.  thousand;millions of

 1. D ninety是確切數(shù)字，故thousand后不加s,排除 A、CV‘數(shù)百萬”應(yīng)用millions of來表達，故選D.

題目來源：全品作業(yè)本八年級英語下冊外研版 > Unit 2 We have not found life on any other planets yet

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