【单选题】I have brought some sandwiches _______we might get hungry.
【简答题】放线菌素D既可以抑制原核细胞的基因转录,又可以抑制真核细胞的基因转录。
【判断题】导数从本质上来说,是一种极限,反映了变化率之比。
【单选题】We don't have ________bread. Would you like ________ sandwiches, please?
【简答题】The old woman lives in a ____ (mountain) area.
【简答题】真核细胞hnRNA转录后的加工包括______、______、______和______,才成为成熟的mRNA。
【简答题】Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need. A. honoured B. set C. hi...
【单选题】The old woman lives _____ a small town. It is ____ two hills( 小山 ).
【单选题】The old woman lives _____ a house _____ a garden.
【单选题】The old woman lives___,but she never feels___.