题目内容

介导细胞免疫的两类T细胞是指

A. Th1,Th2
B. Th1,CTL
C. Th2,CTL
D. Th3,CTL

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关于Th1介导的细胞免疫的特点,下列哪项是错误的

A. 炎症发生较迟
B. 伴有IgE水平增高
C. 主要是巨噬细胞,淋巴细胞参与
D. 局部可出现组织损伤

I am sorry ______ written you a letter at the time.

A. to have not
B. to not have
C. not to have
D. not having

Will you lend him a magazine _________?

A. to be read
B. for reading
C. to read
D. he read

He could do nothing but _for the bus ___.

A. wait, to come
B. wait; come
C. waiting; coming
D. waited; came