– The more ______ you listen to the tape, the ______ you will find it to understand.
A:carefully; more easily
B:careful; more easily
C:carefully; easier
D:careful; easier
777=1()
①原始农业产生后,中国黄河流域率先栽培的主要农作物是____,长江流域率先栽培的主要农作物是____。
②半坡遗址的先民住____房屋,河姆渡遗址的先民住____房屋。