Neither my sister nor I ___________ been to America before.
A:have ever
B:have never
C:has ever
D:has never
将下列有关实验中所需试剂的名称填入横线上:
(1)做过碘升华的容器内壁上粘有碘,用 ____洗涤;
(2)久置石灰水后的试剂瓶用 ____洗涤.
gēn tou
yī shēng
míng xīng
dà xiàng
____
zhuō chóng
pá shān
dà jiě
qīng cǎo