设a→,b→是两个不共线的非零向量，则“向量a→-λb→与λa→-4b→共线”是“λ=2”的（）

题干

A：充分非必要条件

B：必要非充分条件

C：充要条件

D：非充分非必要条件

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B

B

Indoor Water Park
Opening time	◆9: 00a.m.--6:00p.m. from Monday to Friday ◆8: 00a.m.- 10: 00p.m. from Saturday to Sunday
Ticket price	◆Adults: 150 yuan/person: 130 yuan/member ◆Children: above 1.2 meters, 75 yuan/person; 60 yuan/member under 1.2 meters. free
Should not take	food, pets, knives, rings
Things to remember	◆Children under 1. 4 meters and old people above 60 should stay with other adults ◆You should follow the rules in the water park. ◆If you have some health problems and aren't suitable for water activities, you'd better not come in