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【单选题】
下列属于特异性免疫的是：A.
唾液中溶菌酶杀菌作用
B.
胃液的杀菌作用
C.
接种卡介苗
D.
白细胞吞噬病菌
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【单选题】How long does it take him to walk to the bookshop?
A.
Twenty minutes
B.
Half an hour.
C.
Ten minutes
D.
Forty minutes.
【单选题】-- does it take him to get to school? --About fifteen minutes.
A.
How often
B.
How long
C.
How much
D.
How far
【简答题】If Allen drives at an average speed of 60 kilometers per hour. How long does it take him to visit his parents to and fro every month?
【简答题】How long did it take him to run 1,100 miles?Well, __1_ , it took him just 51 days. For six days out of every seven he ran at least 26 miles. In other words, he ran 43 _2_ in less than two months, befo...
【单选题】【图片】如图所示，VD1、VD2均为理想二极管，下列哪个说法是正确的？
A.
两个二极管VD1、VD2均导通。
B.
二极管VD1优先导通。
C.
输出直流电压Uo为6V。
D.
输出直流电压Uo为-3V。
【简答题】How long does it take him to __________ to the shopping mall? (mind drive survey issue)
【单选题】——______ did it take him to draw the horse? ——Half a week.
A.
How much
B.
How often
C.
How long
【单选题】— ______does it take him to come to work by train? — An hour. [ ]
A.
How often
B.
How long
C.
How far
【单选题】M: My father goes to work early every day. W: How long does it take him to walk there? M: About twenty minutes. But sometimes he takes a bus if it rains. 17. How does the boy's father usually go to wo...
A.
On foot
B.
By underground
C.
By bus
D.
By car
相关题目：
【单选题】——______ did it take him to draw the horse? ——Half a week.
A.
How much
B.
How often
C.
How long