高血压Ⅳ级时收缩压为()
A.140~159mmHg
B.130~139mmHg
C.160~179mmHg
D.180~209mmHg
E.>210mmHg
参考答案:E
历史文化名城分为国家级和省级两个层次。
Trees will improve the air and make the park _______ beautiful. [ ]
A. to look
B. looking
C. look
D. looked