单项选择题

怀疑产生ESBLs菌株时，应首先选用下列那类药物
A、第三代头孢菌素
B、第三代头孢+酶抑制剂
C、碳青霉烯类
D、第四代头孢菌素

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Economics is the study of how _____________ are used to produce outputs- goods and services-to be distributed among people.

答案： scarce resources

单项选择题

def save(s):
f=open("test.txt","wt")
f.write(s["name"]+"")
f.write(s["sex"]+"")
f.write(s["age"]+"")
f.close()
def read():
f=open("test.txt","rt")
name=f.readline().strip("")
sex=f.readline().strip("")
age=f.readline().strip("")
print(name)
print(sex)
print(age)
f.close()
s={"name":"xxx","sex":"male","age":"20"}
save(s)
read()
结果是