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【单选题】

To improve one's cognitive ability, scientists suggest in Paragraph 8 that ( ) .

A.
the ways frequently chosen are the best
B.
new ways should be found quickly
C.
any way is good as far as it is safe
D.
various ways should be tried
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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】风湿性心脏病二尖瓣狭窄的患者,最常出现的心律失常是

A.
室性期前收缩
B.
房室传导阻滞
C.
预激综合征
D.
室性阵发性心动过速
E.
心房颤动