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【单选题】
在机构“十字法”保养法中要求检查刹车机构、减速箱、齿轮的磨损情况，（）刹车的抱合度、皮带的松紧度等。A.
紧固
B.
调整
C.
润滑
D.
清洗
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】The author cites his dog to show that dogs______.
A.
are dissimilar to parrots in many aspects
B.
are likely to be frightened by loud sound
C.
have much higher intelligence than birds
D.
are animals with high native intelligence
【单选题】-Are t here any dogs in the house? -No, there aren't ________. [ ]
A.
one
B.
some
C.
any
D.
many
【单选题】—Why do many people keep dogs as pets? —Because they are our ____ friends and they never desert their masters.
A.
wise
B.
brave
C.
loyal
D.
handsome
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