下列不属于糖酵解关键酶的是
A．己糖激酶
B．葡萄糖激酶
C．磷酸甘油酸激酶
D．6-磷酸果糖激酶-1
E．丙酮酸激酶
参考答案：C
"Mr Zhu, you'd better _______ too much meat. You're already over weight." said the doctor. [ ]
A. not to eat
B. not eat
C. eat
D. to eat
下列原因中，（）不是曲轴轴承磨损的原因。
A.燃油中的汽油机润滑油比例太少
B.活塞和气缸之间漏气
C.积炭或脏物进入轴承
D.气门和气门座之间漏气
