小明从家步行到学校,已走的路程与剩下的路程[ ]
A.成正比例
B.成反比例
C.不成比例
答案:C
题目分析:
—It’ s getting dark. Has Mr. Johnson finished his house?
—I have no idea,but this morning he was painting it.
A.to paint
B.painting
C.having painted
D.to have painted
基因工程在畜牧养殖业上的应用有广阔的前景,科学家将某些特定基因与病毒DNA构成重组DNA,然后通过感染或显微注射技术转移到动物的[ ]
A.去核卵细胞中
B.受精卵中
C.乳腺细胞中
D.任何体细胞中