She ______ a strong and positive influence over her friends.
A. draws
B. exerts
C. ensures
D. expends
查看答案
具有抗肠虫作用的免疫调节剂是
A. 白细胞介素
B. 干扰素
C. 转移因子
D. 左旋咪唑
E. 胸腺素
Mary is always ______ when she doesn't get any mail.
A. affected
B. worried
C. puzzled
D. disturbed
According to time writer, compulsive bargain hunters ______.
A. want to save money to help their budgets
B. can boast of their triumph over others in getting things for less
C. will not have money problems if they can keep to their budgets
D. seldom admit they feel satisfied if they can get things for less than others
下列各种青霉素类中哪一种的抗菌作用不是广谱的
A. 青霉素G
B. 氨苄西林
C. 哌拉西林
D. 美洛西林
E. 阿莫西林
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