某婴儿不能消化乳糖，经检测发现他的半乳糖苷酶分子中有一个氨基酸替换为另一个氨基酸，而导致半乳糖苷酶失去功能，其原因是半乳糖苷酶基因中的一个碱基发生了（ ）
关于环绕地球运动的卫星，下列说法正确的是（ ）
B
Indoor Water Park
Opening time
◆9: 00a.m.--6:00p.m. from Monday to Friday
◆8: 00a.m.- 10: 00p.m. from Saturday to Sunday
Ticket price
◆Adults: 150 yuan/person: 130 yuan/member
◆Children: above 1.2 meters, 75 yuan/person; 60 yuan/member under 1.2 meters. free
Should not take
food, pets, knives, rings
Things to remember
◆Children under 1. 4 meters and old people above 60 should stay with other adults
◆You should follow the rules in the water park.
◆If you have some health problems and aren't suitable for water activities, you'd better not come in
