We can make use of seawater by ______ fresh water from it. A: purifying B: refraining C: distilling D: performers
We can make use of seawater by ______ fresh water from it. A: purifying B: refraining C: distilling D: performers
The British ship arrived at the port this morning and is ________ its contents in the harbor now. A: comprehensive B: uncovering C: unloading D: purifying
The British ship arrived at the port this morning and is ________ its contents in the harbor now. A: comprehensive B: uncovering C: unloading D: purifying
If you insist that there is a secret of success, I have to say the only secret is keepingyour dream and making sacrifices. A: pursing B: pursuing C: percussing D: purifying
If you insist that there is a secret of success, I have to say the only secret is keepingyour dream and making sacrifices. A: pursing B: pursuing C: percussing D: purifying
The fuel oil system in the ship's engine room is not included . A: Fuel purifying system B: Fuel transfer system C: Fuel supply system D: Fuel cooling system
The fuel oil system in the ship's engine room is not included . A: Fuel purifying system B: Fuel transfer system C: Fuel supply system D: Fuel cooling system
从分子水平来说，自然选择将淘汰一些对生物生存生殖不利的等位基因，结果就是拥有这些等位基因的个体不能留下后代或留下较少的后代，这种自然选择的类型是： A: 正选择（positive selection） B: 负选择（negative selection or purifying selection） C: 性选择（sexual selection） D: 三个选项都不是
从分子水平来说，自然选择将淘汰一些对生物生存生殖不利的等位基因，结果就是拥有这些等位基因的个体不能留下后代或留下较少的后代，这种自然选择的类型是： A: 正选择（positive selection） B: 负选择（negative selection or purifying selection） C: 性选择（sexual selection） D: 三个选项都不是