4道英语选择题，只求解析

Question

1.Sally is （ 为什么选A ）active girl and she enjoys playing volleyball.
A.the B.a C.an
2.Jane always eats （为什么选C）food.She gets too fat.
A.too many B.too much C.much too
3.Tom decided（为什么选C）the piano from his teacher.
A.learn B.to learn C.learning
4.Mary is only a（为什么选A）girl，but she can speak English and Chinese well.
A.six-year-old B.six years old C.six-years-old

Answer 1

1, 应该选C，谁告诉你选A？（没有特指，元音开头）
2. 选B，C不对。（习惯）
3. 应该选B；decide to do sth.
4. 选A是对的，用-连接起来做形容词，都选用单数。

Answer 2

除了第四题，其他答案好像都有问题的样子，第四题是选A，当six years old 加连字符是years 的s 要去掉，固定的

Answer 3

前三个怎么可能那样选

Answer 4

BBBA