Question

已知條件p:x²+2x-3＞0,條件q:x＞a,若p是q的充分不必要條件，則a的取值范圍是

A.a≥1                B.a≤1                C.a≥-3               D.a≤-3

Answer 1

A  p:x²+2x-3≤0,即-3≤x≤1;q: x≤a.由p是q的充分不必要條件得a≥1.