最佳答案:一组科学家正在实施一项研制h7n9新药的计划a group of scientists are 【 working 】on a project to devel
最佳答案:1.This drug proved to be very effective.2.Although he has everything,he is still
最佳答案:1.Such new drugs effective in this patient is still a problem (remain)2.People a
最佳答案:The Chinese are an industrious nation中华民族是个勤劳的民族.The new drug began to operate n