阅读下面短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项。
What is your favourite colour? Do you like yellow, orange or red? If you do, you 1 be an optimist, a leader, or an active person 2 enjoys life and excitement. Do you prefer gray or blue? Then you are probably 3, shy and you would rather follow than 4. If you love green, you are strong minded and determined. You wish to succeed and want 5 people to see you are successful.
This is what psychologists tell us, and they are sure about this, because they have been seriously studying the meaning of colour preference, 6 the effect that colours have on human beings. They tell us that we won't change our favourite colour as we grow up. A yellow room makes us feel more cheerful and comfortable 7 a dark green one, and a red dress brings warmth and cheer 8the saddest winter day.
But black is depressing. Light and bright colours can make people not only happier but more active. It is a fact that factory workers work better, harder, and have 9 accidents when their machines 10 orange rather than black or dark grey. Remember that, if you feel low, you can always cheer up your day or your life with a new shirt or a new colourful thing.
和实数
，下列命题中真命题是（ ）