⑴Do you know the Great Wall?____
⑵How do you go there?____
⑶How long is Wusi Road?____
⑷How old is your mother?____
⑸How do you feel?____
A. Take a bus.
B. I feel tired.
C. She is 40 years old.
D. Yes,I do.
E. It's about 1000 metres.
用如图所示的简易净水器处理浑浊的河水,下列分析正确的是____ .
A.净化后的河水属于混合物
B.该净水器能将硬水变为软水
C.该净水器能杀菌消毒
D.用活性炭可以除去水中的色素和异味.
关于天然放射性,下列说法中正确的是( )
下列四个地点中,符合“东半球,北半球,低纬度”三个条件的是( )