A high-tech exhibition ________in the National Museum now. Let’s go and visit it.

A．will be held

B．is being held

C．was held

D．has been held

多发性硬化的临床表现，错误的是（）

A.发病年龄多在20～40岁之间

B.男性发病率高于女性

C.若出现核间性眼肌麻痹则高度提示多发性硬化

D.可出现自主神经损害

E.上运动神经元受损的症状多见