Look at the photo. The two girls have big blue eyes and long brown hair. They are both ten years old. They are in the same class. The one in a yellow skirt is Lily. The other (另一个) in an orange skirt is Lucy. Their dad is Mr. White. He is in a brown coat. Their mom is Mrs White. She is in a black dress. Who is that boy in a blue cap? He is Lucy and Lily’s brother(哥哥)Bob. He is a high school student. Look! Lucy and Lily are in a black car.

根据短文内容，选择最佳答案。

小题1: Lucy and Lily are ________ years old.

A. 8                   B. 9                    C. 10

小题2:Lucy and Lily’s hair is ____________.

A. long and brown          B. short and brown         C. long and blond

小题3: Bob wears _________.

A. black shoes             B. a blue cap          C. a brown coat

小题4:Mr. White’s car is ________.

A. black               B. blue                C. green

小题5:Which is TRUE(哪一项是正确的？)

A. Lucy and Lily have two brothers.

B. The girl in an orange skirt is Lily.

C. Mrs. White’s dress is black.

为什么规定发电机定子冷却水水压比氢压低0.049MPa？