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【单选题】
对比动物细胞融合和植物体细胞杂交技术 , 下列论述合理的是 ( ) A. 均可獅 PEG 、电激赦活病毒诱导细胞融合 B. 两者都可以跨越种属间的生殖隔离 C. 两者都可以体现细胞的全能性 D. 在适宜的条件下 , 均可发育成完整个体A.
1
B.
2
C.
3
D.
4
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A.
talking; but
B.
was talking; though
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D.
talked; however
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【单选题】When I entered the classroom, I saw Mary ______ at the desk and ______ a letter.
A.
seating; writing
B.
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A.
Jack was washing dishes as Mary knocked at the door and entered.
B.
Jack was washing dishes while Mary knocked at the door and entered.
C.
Jack was washing dishes when Mary knocked at the door and entered.
D.
Jack was washing dishes as soon as Mary knocked at the door and entered.
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