【单选题】— ________ Miss Brown ________ many English books? — Yes, she ________. [ ]
【单选题】------Does Tom have a brother? -------Yes, she . [ ]
【单选题】How many shirts does the man have?
【简答题】大肠杆菌pUC118质粒的某限制酶唯一酶切序列,位于该质粒的lacZ基因中,lacZ基因中如果没有插入外源基因,lacZ基因便可表达出b-半乳糖苷酶,当培养基中含有IPTG和X-gal时,X-gal便会被b-半乳糖苷酶水解成蓝色,大肠杆菌将形成蓝色菌落;如果lacZ基因中插入了外源基因,带有pUC118质粒的大肠杆菌便不能表达b-半乳糖苷酶,培养基中的X-gal不会被水解成蓝色,大肠杆菌将形成白色...
【单选题】--Does she have a tennis racket? --__________ [ ]
【单选题】华山被称为“西岳”,以下哪项是正确的?()
【单选题】—Does she _____ a knife? —No, she _____. [ ]
【单选题】—Does she have a sister? —____.
【单选题】Why does Clara say 'It depends'?
A.
She does not know where to have the party.
B.
She does not know what to do at the party.
C.
She does not know when to attend the party.