第18题: [单项选择]下列常用于原核表达体系的是( )。 A. 酵母细胞 B. 昆虫细胞 C. 哺乳类细胞 D. 真菌 E. 大肠杆菌 参考答案:E
第19题: [单项选择]Questions 14-17 are based on the following dialogue.What sort of restaurant is the woman looking for A. One that is relatively inexpensive. B. One that is not very crowded. C. One that offers large servings. D. One that is situated close to her hotel. 参考答案:A 答案解析:根据乘客的问句:Can you recommend any good restaurants downtown that offer meals at a reasonable price 意思就是说