A. launch pad
B. multistage rocket
C. orbit
D. artificial satellite
E. telecommunication satellite
F. antenna
G. emergency oxygen apparatus
H. spacecraft
I. lunar module
J. landing pad
K. service module
L. directional antenna
M. ascent stage
N. life support system
O. command module
______发射台 ______指挥舱

A. The location and size of the building.
B. The type and content of the building.
C. The height and structure of the building.
D. The medical information of the firefighters.

A. twins understand each other very well
B. twins are slow to learn to talk
C. twins are unlikely to do less well at school than other children
D. there exists more communication between twins