男性患者，71岁，阵发房颤2年，平时窦性心律，心率50/min，运动或注射阿托品后，心率无明显加快，口服地高辛0.25mg/d，2周后出现一过性晕厥又来就诊，心率35/min，血清地高辛浓度正常，此时最为合适的治疗方法是
A．停服地高辛，给氯化钾
B．停服地高辛，给苯妥英钠
C．继续服地高辛，加用阿托品
D．停用地高辛，给奎尼丁
E．安置临时心脏起搏器
参考答案：E
| Artificial flowers are used for scientific as Well as for decorative purposes. They are made from (51) of materials, such as wax and glass, so skillfully that they can scarcely be (52) from natural flowers. In making such models, painstaking skill and artistry are called for, (53) thorough knowledge of plant structure. The (54) of glass flowers in the Botanical Museum of Harvard University is the most famous in North America and is widely known (55) the scientific world. (56) , there are several thousand models in colored glass, the work of two artist naturalists, Leopold Blalschka and his son Rudolph. The intention was to have the collection (57) at least one member of each flower family native to the United States. (58) it was never completed, it contains more than seven hundred species representing 164 families of flowering plants. (59) detail of these is accurately reproduced in color and structure. The models are (60) n locked cases as they are too valuable and fragile for classroom use. |
A．through
B．throughout
C．over
D．on