题目内容

_earth moves around sun.

A. The,the
B. An,a
C. /,/

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He goes to _____ school at 7 o'clock every day.

A. a
B. /
C. the

_____ live in Room 208.

A. The Green
B. Green
C. The Greens

We should think of _ old and _ sick.

A. a...a
B. the...the

灵敏度是传感器在稳态下1对2的比值。