It uses antiserums that are unable to cross the blood-brain barrier.
It involves a purification process that requires extensive training in endocrinology.
It involves injecting foreign substances directly into the bloodstream.
答案:D/C/B
上文的题目大家答对了几题?大家不仅要多做题,更要善于总结,这样才会有针对性地提高。
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