【单选题】How do the Australians maintain their houses? ______
A.
They seldom clean the houses.
B.
They don’t care their houses very much.
C.
They clean their houses every day and keep everything in good order.
【单选题】According to the passage, how do human bodies maintain balance? ______
A.
They adjust themselves timely in line with their physical conditions.
B.
People increase or lower the body temperature by sweating.
C.
People's hearts pound to compensate when the blood pressure goes up.
【单选题】-__________ will you be in Shanghai? -About three weeks. [ ]
【单选题】_______ is the distance from the mount to the river? [ ]