少年儿童的骨柔韧而有弹性，不易骨折但容易变形，原因是骨的成分中的含量中（　　）

在炎热的夏季，植物不会因为阳光暴晒而灼伤，这有赖于植物的（　　）

如果让你乘上“时空穿梭机”，就可以体验不同的历史时刻，见证各种历史变迁。请根据下列信息在空格中填写有关史实。

① I like swimming. What about you? ____     A. I like swimming, too

② What did you love to do? ____     B. I went to a park.

③ Where did you go last week? ____     C. I usually read books.

④ What do you usually do on weekends? ____     D. I loved to ice-skate.

⑤ How did you go to school yesterday?____     E. By bus.