将抗原和抗体溶液分别加在同一凝胶板的不同孔内，让两者在凝胶中向四周扩散，彼此在相遇处
题型：单项选择题 B型题
问题：
将抗原和抗体溶液分别加在同一凝胶板的不同孔内，让两者在凝胶中向四周扩散，彼此在相遇处特异性结合，形成白色沉淀（）.
A.单向扩散法
B.双向扩散试验
C.对流免疫电泳
D.免疫电泳
E.火箭免疫电泳
题型：单项选择题 B型题
阅读短文，并用括号内所给动词的适当形式填空，必要时，可加助动词或情态动词。
Dear John，
My best friend，Mei，has a problem．There 1 （be）a really important English speech contest for our whole city next mouth. Our classmates want
her to represent the class in the school contest．Everyone is sure she 2 （
win）．It’s probably tree．Mei is very clever 
and 3 （speak） English
really well．In fact，she always 4 （come） top in the school exams，The problem 5 （be）that she is very shy．She 6 （not want）to let her friends down，but she is terrified of 7 （speak）in front of other people．
She is my friend，so she can tell me that she 8 （be）shy．But she
can’t tell everyone that．I don’t think that they 9 （believe）her．I
can’t think of any good advice 10 （give）her, but you always come up
with good solutions to people’s problems．What do you think I should tell the rest of the students?
1．_________ 2．________ 3．________4．_________5．_______
6．_________7．_________8．________9．________ 10．________
