阅读理解。阅读下面的文章，从每题所给的A、B、C、D四个选项中选出最佳选项，并涂在答题卡上相应的位置。

What do you do if you are in trouble on a lonely island? Surely you need to find a way to get in touch with the outside world. Your best chance of doing this is to draw the attention of a passing plane.Body signals

Pilots from different countries understand body signals if they have the correct training, When you wave your arms up and down in a straight line, it means, "yes". When you point downwards and swing your arm from side to side, it means "no". If you want the pilot to know that it's safe to land, push your hands out in front of you and bend your knees. If you want to say that it's not safe to land, put your arms in the air and move them to one side.

Smoke signals

The smoke from a fire can be seen from far away, so it’s a good way to draw attention. If the weather is dry, it isn’t hard to start a fire. Remember, however, that fires can be very dangerous if they get out of control. Never light a tire unless you're sure that it can’t spread. If the ground is dark, light smoke can be seen more easily. Green grass and leaves produce light smoke.

Ground-to-air signals

It's a good idea lo build some signals, too. Use large pieces of wood to make the symbols (标记). If you can't find any wood, use earth. Some useful symbols are：

F "I need food and water"

II "I need medicine."

I "I am badly hurt."

X "I am unable lo move from here."

Pilots' replies

If the pilot lowers the plane's wings from side to side, this means: "message received and understood" (At night, the pilot flashes the plane's green lights.) If the pilot flies the plane in a clockwise circle, this means "message received hut not understood" (At night, the: pilot flashes the plants red lights.)

However, there is no signal which means "message not received.

    You're growing up. That means you're probably experiencing changes, all at once. Your body is changing. It might even seem as if your entire self is changing. It can be confusing and even scary. ____ And it's good!

    Growing up means that you can do more, learn more, and start to make your mark on the world. In order for that to happen, your body produces chemicals called hormones that help both body and mind grow. Hormone levels change constantly, rising and falling.

    ____ But it's partly to blame for intense emotions, surprising reactions, and mood changes.

    Because of the way your brain develops, it is somewhat ruled by emotions now and through your teen years. As a result, growing up can seem like an emotional roller coaster (过山车)!____

    Take care of yourself. If you eat right, sleep enough, and get good exercise, your brain will be much more able to deal with the stress.

    ____ When you feel your moods changing or you're upset, or confused, some quiet time will allow you to gather your thoughts and get calmer.

    Practise relaxing your body and deep breathing when you go to bed.____ Plus, when stuff happens during the day, you'll be able to calm yourself quickly with a deep breath or two before you react. Your body is changing.

A. Take a timeout.

B. Work out regularly to keep physically fit.

C. But the truth is, it happens to every teen.

D. This changing is needed for your body's development.

E. It will help you fall asleep and start the morning right.

F. Here are a few things you can do to make the ride smoother.

G. Usually, these feelings settle down when you realize what is going on.