决定细菌性别的是
A．F质粒B．R质粒C．Vi质粒D．Col质粒E．γ决定因子
参考答案：A
—Look at the wall. There are some pictures ______ it.
—And there are two windows ______ it. [ ]
A. on; on
B. in; on
C. on; in
D. in; in
解决民族问题，实现新疆长治久安的根本途径是（）。
