有关下列实验内容的叙述，正确的是（ ）
A：在低倍镜下可观察到洋葱根尖分生区细胞中有明显的大液泡
B：酵母菌细胞呼吸的产物能使溴麝香草酚蓝水溶液变成灰绿色
C：做“绿叶中色素的提取和分离，实验时，不能让滤液细线触及层析液
D：做“低温诱导染色体数目变化”实验时，固定和解离后都用清水漂洗
给下列的字组词（至少两个）。
哭____ ____ 非____ ____
谢____ ____ 根____ ____
阅读下面短文，从短文后所给的A、B、C、D四个选项中选出能填入相应空白处的最佳选项。
Dear Sally,
How are you? I'm happy that you can do the things you 1 at home. I never have fun, because there are too many 2 in my family. My parents are strict. I have to 3 at six o'clock every morning. And I have to make my bed 4 before breakfast and then go to school. I can't play with my friends after school. I have to do 5homework. After dinner I have to take the dog for 6 walk in the park. I can't watch TV on school nights. I have to 7 the violin for an hour. I can't go to bed late. I have to be in bed 8 nine o'clock. On weekends I have to clean my room and 9the dishes. I also have to go to learn the violin on Sundays. I'm 10 tired. Can you help me?
Yours,
Lisa
