如何使沼气灯明亮？
参考答案：
为使沼气灯明亮，必须调节风门。方法是：调整沼气灯上方的风门，边调边看，直到灯亮、明火消失为止。
China’s first manned spaceship “Shenzhou Ⅴ” was sent up into space on October 15 and returned safely to the earth on October 16,______ is a great honour for our great motherland.
A．that
B．which
C．what
D．it
何谓有害生物综合治理（IPM）和全部种群治理（TPM）？有害生物综合治理的理论基础和指导原则是什么？
