下列哪项不是维生素B2缺乏症的临床表现A．阴囊炎 B．口角炎 C_爱下问搜题

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问题单项选择题

下列哪项不是维生素B₂缺乏症的临床表现

A．阴囊炎

B．口角炎

C．唇炎

D．牙龈炎

E．舌炎

答案

参考答案：D

阅读理解

根据表格内所提供的信息，完成下面介绍比尔盖茨的短文。

Name	Bill Gates
Born	in 1955
Place of birth	the U.S.A.
At the age of 13	start programming
When he was 17 years old	work out a program and sell it for 4,200 dollars
In 1973	go to Harvard University
Two years later	begin his own company (公司)
In 1999	write a book
Hobbies	enjoy reading and playing golf

Bill Gates was born in (1)_____ in the U.S.A.. At the (2)_____ of 13, he started programming.
When he (3)_____17 years old, he worked out a program and sold (4)_____ for 4,200 dollars. In
1973, he (5)_____to Harvard University. Two (6)______ later, he began his own company. In 1999,
he wrote a (7)_____on computer. He enjoyed reading (8)_____ playing golf.

填空题

锚杆螺母必须用机械或力矩扳手拧紧，确保锚杆的托板（）。