某无色溶滚中可能含有Na+、NH4+、Ba2+、Cu2+、SO42﹣、SO32﹣、Cl﹣、Br﹣、CO32﹣中的若干种.为检验其中含有的离子,进行如下实验: ①取10mL溶液,加入足量氯水,.无气体产生,再加入CCl4溶液分层,下层为橙红色; ②分液后,将①中上层溶液加入足量BaCl2和HCl溶液,产生白色沉淀2.33g; ③另取10mL原溶液,加入过量的浓氢氧化钠溶液并加热,收集到标准状况下448ml气体.下列关于原溶液的说法正确的是 A.肯定存在NH4+、Cl﹣、Br﹣ B.SO42﹣、SO32﹣至少含Monday is
the first work day for most(大多数)Americans
and also the first day of the week.
It is eight o'clock on a Monday
morning, and it is ___1_____ A cold wind is ___2_____ and the sky(天空) is grey(灰色的).
Men and women are going ___3_____ work. Some are walking. Some are
riding on bikes. Some are waiting for buses on windy corners(角落)in the rain. ____4____ are driving
their cars, or riding ____5____ the cars of their neighbours(邻居)and friends. The city streets are ____6____
of cars and buses. All are moving slowly, one after another(一个接一个), ___7_____ the city streets and on
the roads between cities and towns.
Children are going to ___8_____
. Some are riding on school buses. Some are riding in ____9____ parents
cars. Many are walking, and they are ____10____ very happy. Life is not
beautiful on a rainy Monday morning.
( )1. A. fine B.
sunny C.
raining D.
snowing
( )2. A. going B.
blowing C.
welcome D.
reading
( )3. A. to B.
at C.
in D.
before
( )4. A. Another B.
Other C.
Others D.
Rest
( )5. A. in B.
by C.
to D.
with
( )6. A. little B.
few C.
empty D.
full
( )7. A. to B.
along C.
up D.
out
( )8. A. play B.
work C.
town D.
school
( )9. A. the B.
their C.
our D.
his
( )10. A. all B.
always C.
never D.
not