加热炉炉膛温度一般控制不大于（）℃。
A.500
B.600
C.700
D.800
参考答案：D
The core of the Natural Approach is ______ which is considered a subconscious process.
A．language learning
B．linguistic competence
C．linguistic capacity
D．language acquisition
带状疱疹好发于（）
A.5～8岁
B.12～18岁
C.30～40岁
D.40～50岁
E.50岁以上
