“自小刺头深草里，而今渐觉出蓬蒿。时人不识凌云木，直待凌云始道高。”这首诗用小松树的成长比喻新事物的成长过程，“时人不识凌云木”是因为（   ）

①新事物具有强大的生命力②新事物的发展是一个过程③新事物最初往往比较弱小④新事物是符合客观规律的

绿色植物利用光提供的能量，在____ 中合成淀粉等有机物，并且把光能转变成____ ，储存在有机物中，这个过程叫做光合作用。

    One day, Pierre, ____ worked in a government office, received an ____ (invite) to a palace ball. His wife, Mathilde, had no money ____ (buy) jewellery, so she borrowed a ____ (beauty) necklace(项链) from ____ (she) friend, Jeanne. She looked very beautiful. And they had ____ wonderful time that evening.

    But after the ball, she ____ (find) the necklace missing. They had to borrow a lot of money to buy a new one for Jeanne. In order to pay back the money, they worked day and night ____ 10 years. Mathilde became very old, so Jeanne didn't recognize her when they met in a park 10 years ____ (late). From this story, we know a person shouldn't be affected by vanity(虚荣心), ____ it will cost him a lot.

丝绸之路犹如一条彩带，曾将古代亚洲、欧洲甚至非洲的文化联结在一起。今天，“一带一路”经济贸易合作将进一步加强文化的传播与交流。这表明文化交流与传播的重要途径是（　　）