【单选题】Regular exercise is a good habit for kids to ___________.
【单选题】Adam Smith mentioned the number 4 800 in order to ______.
A.
show the advantages of the division of labor
B.
emphasize how powerful the individual worker was
C.
show the advantages of the old craft system
D.
emphasize the importance of increased production
【判断题】多动症儿童中,一般男孩发病比例明显高于女孩,男女比例为4-9:1。()
【单选题】盾构机的外壳沿纵向从前到后可分为前盾、中盾、后盾三段。通常所指的支承环是在( )
【单选题】The professor suggested that the students ________ into four groups in the experiment. [ ]