Besides the main missions stipulated by NASA, the orbiter would also be used as
A. a space hospital.
B. a medical research center.
C. a medicine-transporting vehicle.
D. a space ambulance.
查看答案
From the passage we know that the design of the orbiter indicates
A. NASA's determination to continue its space exploration projects.
B. the US space technology superiorities.
C. a victory in space exploration.
D. the birth of an absolutely safe space craft.
Full exposure to the language spoken during the first years of life partly ensures the child's success of learning his mother tongue.
A. Right
B. Wrong
C. Not mentioned
When did the scientists start working on a successor to the shuttle？
A. Immediately after the Columbia disaster.
B. One year after the Columbia disaster.
C. Years before the explosion of Columbia.
D. Not mentioned in the passage.
The reason why children learn their mother tongue so well lies solely in their environment
A. Right
B. Wrong
C. Not mentioned
微信支付 
支付宝支付