【单选题】What did Deng Ling say when Mary told her that she failed the Chinese exam________.
A.
It was really no big deal.
B.
That’s too bad. I feel pity for you.
【判断题】电泳时EB加在琼脂糖凝胶中一般会降低DNA在琼脂糖凝胶电泳中的迁移率。
【单选题】When Deng Ling told Mary she would take events of 100-meter dash and 200-meter dash.Mary said: _____
A.
Wow! I can’t believe it!You are in 2 races!
B.
Isn’t that amazing? You are in 2 races!
C.
That’s absolutely incredible!You are in 2 races!
【单选题】存在于动植物、微生物与人类之间的一类共同抗原称为