A:调查某块草地中的某单子叶植物种群密度,可采用抽样调查法
B:研究红绿色盲的遗传方式应该在患者家系中调查
C:研究外耳道多毛症的遗传方式应调查患者的性别情况
D:调查某森林中一种雄鸟的求偶行为,可采用标志重捕法
若∠α=35°19′,则∠α的余角的大小为____ .
小明和小华在操场上沿直线跑道跑步,他们通过的路程和时间的关系如图所示,则 ____做匀速直线运动, ____前2s内跑得更快(选填“小明”“小华”).
从方框中选择最佳选项完成对话, 有两项多余。
A. Are these your parents?
B. Who is the boy on the left?
C. What’s your father’s job?
D. What’s this?
E. Is your mother a teacher?
F. Is this beautiful girl your sister?
G. What’s your father’s name?
Li Lei—L; Mary—M
L: Good morning, Mary.
M: Good morning, Li Lei.
L: ____
M: It's a photo of my family.
L: Oh. ____
M: Yes, she is. Her name is Lily.
M: Yes, they are.
M: He is a doctor.
M: No, she is a nurse.