问题
单项选择题
脊髓灰质炎病毒主要经过下列哪一个途径传播
A.呼吸道途径
B.血液途径
C.破损皮肤
D.粪-口途径
E.性传播
答案
参考答案：D
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脊髓灰质炎病毒主要经过下列哪一个途径传播
A.呼吸道途径
B.血液途径
C.破损皮肤
D.粪-口途径
E.性传播
参考答案：D
| 阅读理解。 | |
for one to cross at a time. Meeting at the middle of the bridge, neither would give the way to the other. They locked horns, and fought for the right of way, until both fell into the torrent below and were drowned. | |
| 1. The goats _____________ the bridge. | |
| A. was crossing B. have crossed C. were crossing | |
| 2. The bridge was _____________. | |
| A. wide B. rude C. smooth | |
| 3. They fought _____________ their horns. | |
| A. in B. with C. use | |
| 4. The goats were fighting at the _____________ of the bridge. | |
| A. middle B. front C. back |