（Ⅰ）当a=1时，求不等式f（x）≥3x+2的解集

（Ⅱ）若不等式f（x）≤0的解集为{x|x≤﹣1}，求a的值．

著名航海家麦哲伦发现了一条由欧洲出发，经大西洋，到达西印度群岛的新航线。
错误：                       改正：                                 

如果你想研究唐朝时印度和西亚的历史，最好的参考书籍是（    ）

Tom: Hello! My name is Tom. What's your name?

Lily: My name is Lily.

Tom: Are you new?

Lily: Yes!

Tom: What class are you in?

Lily: I'm in Class 1, Grade 6.

Tom: Me too.

Lily: Can you show me our classroom?

Tom: OK! It's on the 3rd floor.