The boats take different routes, but they all in the same place.
A:give up
B:clear up
C:end up
D:make up
下列晶体熔沸点由高到低的顺序正确的是( )
①SiC ②Si ③HCl ④HBr ⑤HI ⑥CO ⑦N2 ⑧H2.
读“我国甲、乙两地区图”,完成下列问题。