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问题
单项选择题 A1型题
能够引起牛烂蹄病的霉菌毒素是（）
A.赭曲霉毒素A
B.丁烯酸内酯
C.玉米赤霉烯酮
D.T-2毒素
E.展青霉毒素
答案
参考答案：
B
填空题
3257至少加上（ ）就一定含有因数3。
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选择题
.The workers risked their lives to restore communications in the disaster-stricken areas , which were cut off______the powerful earthquake .
A．in case of
B．in spite of
C．instead of
D．because of
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