问题 选择题

单克隆抗体制备过程中,骨髓瘤细胞和B淋巴细胞融合后,要用特定的培养基筛选出杂交瘤细胞,在这种培养基上不能存活增殖的细胞是

①B淋巴细胞 ②小鼠骨髓瘤细胞 ③B淋巴细胞自身融合细胞 ④小鼠骨髓瘤细胞自身融合细胞 ⑤杂交瘤细胞[ ]

A.①②③④

B.①③⑤

C.②④

D.②③

答案

答案:A

阅读理解

Jack used to curse(咒骂) the front yard as if it were a living thing. He was the man who lived with my grandmother for thirty years. He was not my grandfather, but an Italian who came down the road one day, selling fruit in Florida.

Jack stopped at my grandmother’s house to sell her some oranges just a stone’s throw from downtown Miami, and he was delivering her whiskey a week later. He stayed for thirty years. Jack hated the front yard because he thought it was against him. There had been a beautiful lawn(草坪) there when Jack came along, but he let it wander off into nothing. He refused to water it or take care of it in any way.

Now the ground was so hard that it gave his car flat tires(轮胎) in the summer. The yard was always finding a nail to put in one of his tires or the car as always sinking out of sight in the winter when the rains came on. The lawn had belonged to my grandfather, who lived out the end of his life in an insane hospital. It had been his pride and joy and was said to be the place where his powers came.

小题1:It can be inferred that the real reason Jack had problems with the yard was that _______.

A.he didn’t like the lawn.

B.the author’s grandfather was against Jack working on the lawn

C.the lawn was full of living things

D.he himself did not take care of the lawn小题2:We can learn from the passage that when the lawn belonged to the author’s grandfather, it had been _______.

A.beautiful

B.worn out

C.wasted

D.full of nails小题3:What do we know about Jack and the author’s grandfather?

A.They both hated the front lawn.

B.Jack was jealous of the author’s grandfather.

C.They sold fruit in Florida.

D.They came from Italy and lived together.

单项选择题 A2型题