She（）her nervousness to the importance of the interview.
A. contributed
B. dedicated
C. distributed
D. attributed
Others argue that since the earth has endured a long string of ice ages in the last two million to three million years, any warming is（）to be temporary.
A. seemed
B. likely
C. tended
D. possible
沸石类矿物对锶、铯吸附以（）为主。
A. 物理吸附
B. 化学吸附
C. 物理和化学吸附
D. 离子吸附
F+和F-杂交时，以下哪个表述是错误的？（）
A. F-细胞转变为F+细胞
B. F+细胞转变为F-细胞
C. 染色体基因不转移
D. 细胞与细胞间的接触是必须的
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