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【单选题】
测定土壤质地,手搓成泥条,泥条变成环,压扁无裂痕,则该土壤质地是A.
轻壤土
B.
中壤土
C.
重壤土
D.
黏土
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皮皮学刷刷变学霸
举一反三
【单选题】药物对动物急性毒性的关系是
A.
LD50 越大,越容易发生毒性反应
B.
LD50 越大,毒性越小
C.
LD50 越小,越容易发生过敏反应
D.
LD50 越大,毒性越大
E.
LD50 越大,越容易发生特异质反应
【单选题】立克次体与细菌的主要区别是（）
A.
立克次体有细胞壁和核糖体
B.
立克次体含有DNA和RNA两种核酸
C.
立克次体以二分裂方式繁殖
D.
立克次体能人工培养
E.
立克次体是严格的细胞内寄生
【单选题】He had studied hard, he would have been able to pass the exam.
A.
He had studied harder
B.
if only he studied more
C.
Had he studied harder
D.
When he studied more
【简答题】He studied very hard all the time because he didn’t want to _____in his studies. A. fall behind B. be left behind C. left behind D. Both A and B
【单选题】He studied hard at school when he was young, ______ contributes to his success in later life.
A.
which
B.
that
C.
what
D.
each of which
【单选题】药物对动物急性毒性的关系是
A.
LD越大，越容易发生毒性反应
B.
LD越大，毒性越小
C.
LD越小，越容易发生过敏反应
D.
LD越大，毒性越大
E.
LD越大，越容易发生特异质反应
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