A:①②
B:①③
C:②③
D:③④
根据所给提示,完成句子。每空一词,含缩略词。(1)He did his homework last night. (改为否定句)He ____ ____ his homework last night.(2)The kid is playing the piano at the school music club. (对划线部分提问)____ is the kid ____ the piano?(3)Visitors love this city because it has historical sights and delicious food. (改为同义句)Visitors love this city ____ ____ its historical sights and delicious food.(4)他两个月没有收到他儿子的信了。(完成译句)He hasn’t ____ ____ his son for two months.
如图反映的过程是小明从家去食堂吃早餐,接着去图书馆读报,然后回家.其中x表示时间,y表示小明离家的距离,小明家、食堂、图书馆在同一直线上.根据图中提供的信息,有下列说法:
(1)食堂离小明家0.4km;
(2)小明从食堂到图书馆用了3min;
(3)图书馆在小明家和食堂之间;
(4)小明从图书馆回家的平均速度是0.04km/min.
其中正确的有( )
1959年法国人类遗传学家李求恩等第一次发现先天愚型患者的染色体是47条,比正常人46条多了一条小型染色体.请问该病会遗传吗( )