填空题

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
应急养装置人造卫星

【参考答案】

G D

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单项选择题

What’s the reason for twins to be at a disadvantage in their intellectual development（）

A. They can only understand their own private language.
B. They communicate with outsiders less than non-twins.
C. There is little stimulation for them.
D. Adults don’t like to talk with them.

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