关于工具避孕方法的避孕原理,不正确的是()
A.阻止精卵结合
B.阻止精子进入宫腔
C.抑制排卵
D.改变输卵管蠕动
E.子宫内膜无菌性炎症
参考答案:C
Which does your sister enjoy ______ her weekend, traveling or going shopping? [ ]
A. spending
B. spend
C. to spend
D. being spent
与其他的交通工具想比,船舶的燃油储量是最大的.