I love ice-cream,______ I can't eat too much, because I don't want to be fat.
A. and
B. but
C. or
D. so
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She doesn't send emails _____watch movies on computer.
A. and
B. or
C. so
D. but
There are no buses, ______you'll have to walk.
A. so
B. or
C. but
D. for
Amy is ______. She often helps old people cross the road.
A. careful
B. helpful
C. hard-working
D. sporty
测距方法有( ).
A. 扩频法
B. 带外法
C. 动态法
D. 带内法