已知角的终边上有一点（– 1，2），则$\cos \alpha$的值为 （   ）

不管花的外形如何，花的结构中最重要的部分是　______，受精后子房发育成　_______．

Live longer

    Everyone wants to live longer. We try to exercise, eat right and get enough sleep.____Here are a few tips for you to live a longer,happier and healthier life.

    Use your mind

    Actively use your mind, and you'll cut your risk (风险) of developing dementia(痴呆) in half____Memorize phone numbers in your cellphone.As you put groceries into your basket,add them up in your mind.

    Chew (咀嚼) your food

    When you eat, chew your food slowly and fully. That makes it easier for your body to use the food nutrients. Also, it takes 20 minutes for your stomach to tell your brain it's full.____

    Make time for yourself

    We all have plenty of stress (压力) in our daily lives. Be sure to find some ways to make that stress less. Taking some kind of activities will do you good.____Have dinner out with friends.Start a new hobby. Do something you enjoy, just for you.

    It's not about me

    ____Studies show that volunteering increases your lifespan(寿命). It also builds your social network.And having lots of friends around,especially in old age, helps you live longer.

A. Take an exercise class.

B. But other things can also help.

C. Do things slowly,one at a time.

D. Living longer is not an easy thing.

E. If you want to live longer,help others.

F. Think of fun games to play by yourself.

G. If you eat more slowly, you'll likely eat less.

据新闻报道，英国人阿克毛在中国贩毒4千克而被判死刑。当年英国人就向林则徐保证 “永不敢夹带鸦片，如有夹带，一经查出，货即没官，人即正法”，林则徐销毁鸦片的地点是（   ）