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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】房室交点为
A.
左冠状动脉与肺动脉干的交点
B.
前室间沟与冠状沟的交点
C.
前、后室间沟的交点
D.
前室间沟、后房间沟与冠状沟的交点
E.
后室间沟、后房间沟与冠状沟的交点
【单选题】若直线ax+by=3与圆C：x2+y2=4有两个不同的交点，则点P(a，b)与圆C的关系是
A.
在圆内
B.
在圆外
C.
在圆上
D.
不确定
E.
以上答案均不正确
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s surface, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s surface
D.
it has caused many visitors to injure themselves