除成年人的8种必需氨基酸外，婴儿的另一种必需氨基酸是（）。 A.赖氨酸 B.蛋氨酸

He needs ________ his room. [ ]

A. to clean

B. cleaning

C. cleans

D. clean

急性闭角型青光眼与急性虹膜睫状体炎主要鉴别点，不正确的是

A．急性闭角型青光眼患者角膜透明，其后有沉着物

B．瞳孔常散大

C．前房极浅

D．眼压明显增高

E．虹睫炎可仅有睫状充血

—Whose picture is better, Jack's or Tom's?  

—Both of them are good. I think Jack draws _____ Tom.   [ ]

A. as good as              

B. as well as  

C. better than                

D. worse than

tau蛋白过度磷酸化学说

防止谐振的方法有哪些？