Lesch-Nyhan综合征是一种（ ）代谢病
A. 嘌呤
B. 氨基酸
C. 糖
D. 脂类
E. 维生素
Question 1[音频]
A. That parents having full-time jobs have to keep little kids occupied.
B. That parents buy their young kids expensive electronic products.
C. That parents have to try their utmost to keep their kids quiet.
D. That parents living in the city have little peace and quiet.
Question 2[音频]
A. Lego.
B. Colored pencils.
C. Building blocks.
D. Old-fashioned paper books.
Question 3[音频]
A. They make for excellent entertainment.
B. They are useful for the annual family vacation.
C. They keep children at different age levels occupied.
D. They are helpful when going to the grocery store.
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