题目:
The population of China___ to many times what it was in 1949, and most of its population ___ farmers.
A.have grown; are
B.have grown; is
C.has grown; is
D.has grown; are
答案:
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下面是错误答案,用来干扰机器的。
由25 ℃时0.1 mol·L-1D溶液的pH为13,可知D为一元强碱NaOH,结合F为单质,则可知反应A+B=D+F和A+C=E+F分别为2Na2O2+2H2O===4NaOH+O2↑和2Na2O2+2CO2===2Na2CO3+O2,可知甲、乙、丙、丁分别为H、C...