进食后，心肌细胞的主要能源物质，是下列哪种物质（）。 A.葡萄糖 B.氨基酸 C.多

阅读理解。

     Do you remember when your grandma told you the story of Snow White? Ah, the happy days of

childhood! 

     But did you know that Snow White comes from Germany? It's just one story from the 209 in Grimm's

Fairy Tales (《格林童话》). The Grimm brothers started to collect fairy tales in 1806. Their first book

came out in 1812.

     Why are German fairy tales so interesting? Maybe it's because they come from a great place famous for

its stories-the Black Forest.

     The Black Forest is in southwest Germany. It's the largest forest in the country-and one of the most

beautiful. It's famous for its trees and lovely views. There are valleys and waterfalls (瀑布) there. It's a good

place to start a story.

     Don't forget to bring something back if you visit. People there are good at making clocks, musical

instruments and watches.

1. From the story, we know that ____ is the hometown of Snow White. [ ]

A. England

B. Japan

C. America

D. Germany

2. How long had the Grimm brothers been collecting stories? [ ]

A. Four years

B. Five years

C. Six years

D. Seven years

3. From the story, we cannot guess that the Black Forest is very ____. [ ]

A. large

B. beautiful

C. boring

D. famous

4. The story mainly tells us ____. [ ]

A. who wrote the story of Snow White

B. some things about Black Forest

C. people should visit Germany

D. Snow White is a very famous fairy tale.

要使蓄能器装置上的三位四通换向阀处于中位，在司控台是可以实现的。（）

曲线y=xe^x的拐点坐标是

A．(0，1)
B．(1，e)
C．(-2，-2e^-2)
D．(-2，-2e²)

对麻痹性斜视的治疗主要是（）

A.配戴眼镜

B.同时矫治弱视

C.常规遮盖

D.运动锻炼

E.找出病因进行治疗

被称为“东方第一个几何学家”的我国学者是_______．

A．华罗庚

B．李善兰

C．华蘅芳

D．苏步青