从A、B、C中选择合适的介词

The sun is shining. Let's sit _____ the umbrella.

A. on B under C. beside

Read and think

Switzerland is a small country with mountains, forests and blue lakes. In winter the sun is bright, but the air is cold. People go to Switzerland for the winter sports. They wear warm clothes and sunglasses. They stay at hotels. The hotels are in the valleys or on the sides of the mountains. People go up the mountains in lifts and ski down. In the valley they skate on the lakes. Visitors go to Switzerland in the summer time, too. They can climb the mountains or walk in the forests. They can swim in warm lakes or they can sail. People call Switzerland the playground of Europe(欧洲).

The sun is very________ .(热)