Sophia is very happy these days. The 13-year-old girl from the UK has a lot of fun during her trip in Beijing. She eats dumplings, tries Chinese calligraphy(书法), climbs the Great Wall and speaks Chinese, all for the first time!

She even stays with a Chinese family for a week. “Beijing is very big and beautiful. And the people here are very nice!” She says. Sophia comes with her teachers and classmates from the UK. The students in Shangdi Experimental Primary School of Haidian District receive them. These two schools are “Heart to Heart” schools. There are 200 “Heart to Heart” schools in Beijing. Each of them has a partner school in a foreign country. They meet and get to know each other.

小题1:How old is Sophia?

A．15

B．14

C．13

D．11小题2:How long did Sophia stay with a Chinese family?

A．Two days.

B．Seven days.

C．A year.

D．6 months.小题3:What did Sophia think of Beijing?

A. Big.        B. Beautiful.     C. Exciting.       D. A and B.

如图1中甲、乙、丙三条曲线分别表示食物中三种营养物质在消化道中的变化情况，读图并填空：

（1）图1中曲线乙表示______的消化．

（2）从图1中看，淀粉最终在______中彻底消化分解成葡萄糖．

（3）葡萄糖被吸收进入血液后，导致血糖超过正常含量，刺激体内的感受器，引起激素调节，______的分泌增加，使血糖含量下降，维持在正常水平．

（4）某同学为了进一步研究淀粉的消化，用图2中A、B两支试管分别装入2毫升淀粉糊，再分别加入不同物质，如图2所示．比较A、B两支试管，可以证明淀粉酶能______．

（5）像淀粉酶这样的生物酶在人体内还有很多，它们具有高效性、______和多样性特点．