将目的基因导入受体细胞（菌）之前，要用Ca2+处理细胞，处理过的细胞叫（）
A.感受态细胞
B.敏感性细胞
C.吸收性细胞
D.接受细胞
参考答案：A
尺寸公差可正、可负、可零。（）
翻译句子。
1. The plane flew parallel to the coast.
2. This tradition has no parallel in our culture.
3. The road and the channel are parallel to each other.
4. Their legal system parallels our own.
5. The police officer saw a parallel between the two murder cases.
