One morning last week I looked out of my study window and saw that it was a fine day. No, it was a wonderful day: the sun shone down from a sky without even a single cloud. But later that day, hard at work at my desk, I heard a loud noise on the roof. Turning to the window, I saw that the sky was now the color of charcoal. Two minutes later the rain poured, making rivers of water.

    ____It's extremely variable. Go ahead with your picnic in the local park by all means, but don't suppose that because the sun is shining now, it will be when you open your pack of sandwiches.  ____

    The weather in Britain is not always bad.____This is one of the biggest reasons why the British talk so often about the weather. Wherever there are strangers standing or sitting close together, and talk can not be avoided. The conversation focuses on the weather: “Yes, the weather has been good, hasn't it?” or “____”

    The unexpected change of the weather is something that every British can agree on.____ Even those with different opinions on everything else in the world, such as the argument in the UK about membership of the European Union, can talk about the weather without leading to a quarrel.

A. It is just changeable.

B. That makes it a safe topic of conversation.

C. You'd better take an umbrella, just in case.

D. What shocking weather we've been having!

E. Strangers will choose to talk about the weather to break the ice.

F. This story will give you some idea about weather in Britain.

G. Are you going for a picnic?

“湘西椪柑”是我州著名的“名片”．它的皮属于植物体的什么组织（　　）