His oral English is _____ than his brother's.
A. well
B. good
C. better
D. fine
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I would rather _____ a job and earn money.
A. to find
B. finding
C. found
D. find
蛋白激酶类细胞癌基因的产物为某种__,与生长因子结合后,形成蛋白质酪氨酸激酶,触发细胞内的一系列反应。例如,ERBB1癌基因的产物为表皮生长因子受体。
基因治疗按其受体细胞不同分类,则有___、____两类