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【单选题】
主要的免疫预防的方法有A.
采用人工免疫方法
B.
采用各种抗生素
C.
采用各种免疫抑制剂
D.
采用免疫增强剂
E.
采用干扰素
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【单选题】The Australian boy has a good ________ of Chinese and can express himself freely in it.
A.
power
B.
command
C.
demand
D.
usage
【简答题】The potato crop of 1946 was ____ that of 1945. A) superior than B) superior to C) more superior to D) more superior than
【单选题】前往新疆边境管理区旅游的内地居民,须持规定的有效证件,经 ( ) 查验后,才能进入边境管理区。
A.
公安检查站
B.
二线边境检查站
C.
公安派出所
D.
边防检查站
【简答题】Maize is an unsuitable crop in much of southern Africa because it requires ______.
【简答题】A major crop disease, if not checked, would result in ______.
【简答题】The new technique for growing rice will certainly ______ the increase of crop yields or a large scale.
【单选题】One explanation given by scientists for the crop circles is that they are made by ______.
A.
airplane crashes
B.
air movement
C.
unknown flying objects
D.
new farming techniques
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