左侧精索静脉曲张的原因之一是
A. 左侧睾丸静脉以直角注入左髂外静脉
B. 左侧睾丸静脉以直角注入左髂内静脉
C. 左侧睾丸静脉以直角注入左髂总静脉
D. 左侧睾丸静脉以直角注入下腔静脉
E. 左侧睾丸静脉以直角注入左肾静脉
上腔静脉在注入右心房之前接受的静脉是
A. 奇静脉
B. 半奇静脉
C. 副半奇静脉
D. 颈内静脉
E. 锁骨下静脉
What is the distance between the first letter and the last letter of “smiles”?
A. a meter
B. a kilometers
C. a mile
D. 2 miles
What would be the next group of letters in this series? aaaa ... bdzb ... cgac ...djzd ... ???? (下一组字母是什么?)
A. enae
B. ekze
C. elxe
D. emae
E. eize