第6题: [单项选择]紫外线杀菌的最佳波长为( ) A. 200nm B. 260nm C. 560nm D. 300nm E. 650nm 参考答案:B
第7题: [单项选择]Ms. Green has been living in town for only one year, yet she seems to be ______ with everyone who comes to the store. A. acquainted B. informed C. accustomed D. accepted 参考答案:A 答案解析:[解析] 固定搭配题。be acquainted with意为“相识,熟悉”。[B]项用在词组be informed中,后常与介词of连用,表示“听说,接到…的通知”;选项[C]用在词组be accu