It con be inferred from the passage that children onrmally learn simple counting ______.
A.soon after they learn to talk
B.by looking at the clock
C.when they begin to be mathematically mature
D.after they reach the second grade in school
第1题
术后病人内出血,最早的表现是
A、血压下降
B、面色苍白
C、呼吸急促
D、四肢湿冷、脉细弱
E、胸闷、口渴、脉快
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